1
|
Uwibambe E, Shyaka A, Niyotwagira E, Mutoniwase J, Fèvre EM, Quinnell RJ, Trevisan C. The Vicious Worm education tool improves the knowledge of community health workers on Taenia solium cysticercosis in Rwanda. PLoS Negl Trop Dis 2024; 18:e0012140. [PMID: 38630842 PMCID: PMC11057718 DOI: 10.1371/journal.pntd.0012140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 04/29/2024] [Accepted: 04/05/2024] [Indexed: 04/19/2024] Open
Abstract
The pork tapeworm Taenia solium causes human taeniasis and cysticercosis when ingested as viable cysts and eggs, respectively. Despite its high health burden in low-income countries, knowledge of the parasite in endemic areas such as Rwanda is often limited. Here, we assess whether The Vicious Worm education software can increase knowledge in endemic areas of Rwanda. A cross-sectional mixed-methods study was conducted to evaluate knowledge about T. solium among community health workers trained using the Vicious Worm education software. Knowledge was assessed before, immediately after, and four weeks after the training. The health workers perceptions of the software were analysed thematically. A total of 207 community health workers were recruited from Nyamagabe district in Southern Province, Rwanda. Participants were composed of males (33.5%) and females (66.5%), aged between 22 and 68 years, and most (71%) had only completed primary education. Knowledge of cysticercosis at baseline was low, particularly knowledge of human cysticercosis and neurocysticercosis. The overall knowledge score increased significantly after training and was maintained four weeks after the training. Overall, insufficient knowledge was associated with neurocysticercosis-related questions, which after the training, remained relatively lower compared to questions of other categories. Participants reported the software to be user-friendly and educational. Digital illiteracy and the lack of smartphones were among the critical challenges highlighted in responses. This study has shown gaps in knowledge regarding T. solium infections within rural Rwanda, particularly neurocysticercosis. Health education using the Vicious Worm education software should be considered in integrated control programs.
Collapse
Affiliation(s)
- Esther Uwibambe
- Center for One Health, University of Global Health Equity, Butaro, Rwanda
| | - Anselme Shyaka
- Center for One Health, University of Global Health Equity, Butaro, Rwanda
| | - Egide Niyotwagira
- Center for One Health, University of Global Health Equity, Butaro, Rwanda
| | | | - Eric M. Fèvre
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, United Kingdom
- International Livestock Research Institute, Nairobi, Kenya
| | - Rupert J. Quinnell
- Faculty of Biological Sciences, School of Biology, University of Leeds, Leeds, United Kingdom
| | - Chiara Trevisan
- Department of Translational Physiology, Infectiology and Public Health, Faculty of Veterinary Medicine, Ghent University, Belgium
- Department of Public Health, Institute of Tropical Medicine, Antwerp, Belgium
| |
Collapse
|
2
|
Sadlowski H, Schmidt V, Hiss J, Kuehn JA, Schneider CG, Zulu G, Hachangu A, Sikasunge CS, Mwape KE, Winkler AS, Schuelke M. Diagnosis of Taenia solium infections based on "mail order" RNA-sequencing of single tapeworm egg isolates from stool samples. PLoS Negl Trop Dis 2021; 15:e0009787. [PMID: 34890398 PMCID: PMC8694474 DOI: 10.1371/journal.pntd.0009787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 12/22/2021] [Accepted: 11/22/2021] [Indexed: 11/18/2022] Open
Abstract
Combined community health programs aiming at health education, preventive anti-parasitic chemotherapy, and vaccination of pigs have proven their potential to regionally reduce and even eliminate Taenia solium infections that are associated with a high risk of neurological disease through ingestion of T. solium eggs. Yet it remains challenging to target T. solium endemic regions precisely or to make exact diagnoses in individual patients. One major reason is that the widely available stool microscopy may identify Taenia ssp. eggs in stool samples as such, but fails to distinguish between invasive (T. solium) and less invasive Taenia (T. saginata, T. asiatica, and T. hydatigena) species. The identification of Taenia ssp. eggs in routine stool samples often prompts a time-consuming and frequently unsuccessful epidemiologic workup in remote villages far away from a diagnostic laboratory. Here we present "mail order" single egg RNA-sequencing, a new method allowing the identification of the exact Taenia ssp. based on a few eggs found in routine diagnostic stool samples. We provide first T. solium transcriptome data, which show extremely high mitochondrial DNA (mtDNA) transcript counts that can be used for subspecies classification. "Mail order" RNA-sequencing can be administered by health personnel equipped with basic laboratory tools such as a microscope, a Bunsen burner, and access to an international post office for shipment of samples to a next generation sequencing facility. Our suggested workflow combines traditional stool microscopy, RNA-extraction from single Taenia eggs with mitochondrial RNA-sequencing, followed by bioinformatic processing with a basic laptop computer. The workflow could help to better target preventive healthcare measures and improve diagnostic specificity in individual patients based on incidental findings of Taenia ssp. eggs in diagnostic laboratories with limited resources.
Collapse
Affiliation(s)
- Henrik Sadlowski
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, NeuroCure Cluster of Excellence, Berlin, Germany
| | - Veronika Schmidt
- Department of Neurology, Centre for Global Health, Klinikum rechts der Isar, Technical University Munich (TUM), Munich, Germany
- Centre for Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
| | - Jonathan Hiss
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, NeuroCure Cluster of Excellence, Berlin, Germany
| | - Johannes A. Kuehn
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, NeuroCure Cluster of Excellence, Berlin, Germany
| | - Christian G. Schneider
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, NeuroCure Cluster of Excellence, Berlin, Germany
| | - Gideon Zulu
- School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Alex Hachangu
- School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | | | - Kabemba E. Mwape
- School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Andrea S. Winkler
- Department of Neurology, Centre for Global Health, Klinikum rechts der Isar, Technical University Munich (TUM), Munich, Germany
- Centre for Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
| | - Markus Schuelke
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, NeuroCure Cluster of Excellence, Berlin, Germany
- Charité-Universitätsmedizin Berlin, corporate member of the Freie Universität Berlin and Humboldt-Universität zu Berlin, Department of Neuropediatrics, Berlin, Germany
- * E-mail:
| |
Collapse
|
3
|
Del Brutto OH, Garcia HH. The many facets of disseminated parenchymal brain cysticercosis: A differential diagnosis with important therapeutic implications. PLoS Negl Trop Dis 2021; 15:e0009883. [PMID: 34793447 PMCID: PMC8601456 DOI: 10.1371/journal.pntd.0009883] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Neurocysticercosis (NCC), the infection of the nervous system by the cystic larvae of Taenia solium, is a highly pleomorphic disease because of differences in the number and anatomical location of lesions, the viability of parasites, and the severity of the host immune response. Most patients with parenchymal brain NCC present with few lesions and a relatively benign clinical course, but massive forms of parenchymal NCC can carry a poor prognosis if not well recognized and inappropriately managed. We present the main presentations of massive parenchymal NCC and their differential characteristics.
Collapse
Affiliation(s)
- Oscar H. Del Brutto
- School of Medicine, Universidad Espíritu Santo—Ecuador, Samborondón, Ecuador
| | - Hector H. Garcia
- Center for Global Health, Department of Microbiology, Universidad Peruana Cayetano Heredia, Lima, Perú
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurológicas, Lima, Perú
- * E-mail:
| |
Collapse
|
4
|
Pray IW, Pizzitutti F, Bonnet G, Gonzales-Gustavson E, Wakeland W, Pan WK, Lambert WE, Gonzalez AE, Garcia HH, O’Neal SE. Validation of a spatial agent-based model for Taenia solium transmission ("CystiAgent") against a large prospective trial of control strategies in northern Peru. PLoS Negl Trop Dis 2021; 15:e0009885. [PMID: 34705827 PMCID: PMC8575314 DOI: 10.1371/journal.pntd.0009885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 11/08/2021] [Accepted: 10/08/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The pork tapeworm (Taenia solium) is a parasitic helminth that imposes a major health and economic burden on poor rural populations around the world. As recognized by the World Health Organization, a key barrier for achieving control of T. solium is the lack of an accurate and validated simulation model with which to study transmission and evaluate available control and elimination strategies. CystiAgent is a spatially-explicit agent based model for T. solium that is unique among T. solium models in its ability to represent key spatial and environmental features of transmission and simulate spatially targeted interventions, such as ring strategy. METHODS/PRINCIPAL FINDINGS We validated CystiAgent against results from the Ring Strategy Trial (RST)-a large cluster-randomized trial conducted in northern Peru that evaluated six unique interventions for T. solium control in 23 villages. For the validation, each intervention strategy was replicated in CystiAgent, and the simulated prevalences of human taeniasis, porcine cysticercosis, and porcine seroincidence were compared against prevalence estimates from the trial. Results showed that CystiAgent produced declines in transmission in response to each of the six intervention strategies, but overestimated the effect of interventions in the majority of villages; simulated prevalences for human taenasis and porcine cysticercosis at the end of the trial were a median of 0.53 and 5.0 percentages points less than prevalence observed at the end of the trial, respectively. CONCLUSIONS/SIGNIFICANCE The validation of CystiAgent represented an important step towards developing an accurate and reliable T. solium transmission model that can be deployed to fill critical gaps in our understanding of T. solium transmission and control. To improve model accuracy, future versions would benefit from improved data on pig immunity and resistance, field effectiveness of anti-helminthic treatment, and factors driving spatial clustering of T. solium infections including dispersion and contact with T. solium eggs in the environment.
Collapse
Affiliation(s)
- Ian W. Pray
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
| | - Francesco Pizzitutti
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
| | - Gabrielle Bonnet
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
| | - Eloy Gonzales-Gustavson
- Tropical and Highlands Veterinary Research Institute, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, EL Mantaro, Peru
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Wayne Wakeland
- Systems Science Program, Portland State University, Portland, Oregon, United States of America
| | - William K. Pan
- Duke Global Health Institute & Nicholas School of Environment, Duke University, Durham, North Carolina, United States of America
| | - William E. Lambert
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
| | - Armando E. Gonzalez
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Hector H. Garcia
- School of Sciences, Department of Microbiology, Universidad Peruana Cayetano Heredia, Lima, Peru
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Seth E. O’Neal
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | | |
Collapse
|
5
|
Ngwili N, Johnson N, Wahome R, Githigia S, Roesel K, Thomas L. A qualitative assessment of the context and enabling environment for the control of Taenia solium infections in endemic settings. PLoS Negl Trop Dis 2021; 15:e0009470. [PMID: 34115758 PMCID: PMC8221787 DOI: 10.1371/journal.pntd.0009470] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 06/23/2021] [Accepted: 05/12/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Taenia solium (T. solium), is a zoonotic helminth causing three diseases namely; taeniasis (in humans), neurocysticercosis (NCC, in humans) and porcine cysticercosis (PCC, in pigs) and is one of the major foodborne diseases by burden. The success or failure of control options against this parasite in terms of reduced prevalence or incidence of the diseases may be attributed to the contextual factors which underpin the design, implementation, and evaluation of control programmes. METHODOLOGY/PRINCIPAL FINDINGS The study used a mixed method approach combining systematic literature review (SLR) and key informant interviews (KII). The SLR focused on studies which implemented T. solium control programmes and was used to identify the contextual factors and enabling environment relevant to successful inception, planning and implementation of the interventions. The SLR used a protocol pre-registered at the International prospective register of systematic reviews (PROSPERO) number CRD42019138107 and followed PRISMA guidelines on reporting of SLR. To further highlight the importance and interlinkage of these contextual factors, KII were conducted with researchers/implementers of the studies included in the SLR. The SLR identified 41 publications that had considerations of the contextual factors. They were grouped into efficacy (10), effectiveness (28) and scale up or implementation (3) research studies. The identified contextual factors included epidemiological, socioeconomic, cultural, geographical and environmental, service and organizational, historical and financial factors. The enabling environment was mainly defined by policy and strategies supporting T. solium control. CONCLUSION/SIGNIFICANCE Failure to consider the contextual factors operating in target study sites was shown to later present challenges in project implementation and evaluation that negatively affected expected outcomes. This study highlights the importance of fully considering the various domains of the context and integrating these explicitly into the plan for implementation and evaluation of control programmes. Explicit reporting of these aspects in the resultant publication is also important to guide future work. The contextual factors highlighted in this study may be useful to guide future research and scale up of disease control programmes and demonstrates the importance of close multi-sectoral collaboration in a One Health approach.
Collapse
Affiliation(s)
- Nicholas Ngwili
- Animal and Human Health Program, International Livestock Research Institute, Nairobi, Kenya
- College of Agriculture and Veterinary Sciences, University of Nairobi, Nairobi, Kenya
| | - Nancy Johnson
- CGIAR Research program on Agriculture for Nutrition and Health, IFPRI, Washington, DC, United States of America
| | - Raphael Wahome
- College of Agriculture and Veterinary Sciences, University of Nairobi, Nairobi, Kenya
| | - Samuel Githigia
- College of Agriculture and Veterinary Sciences, University of Nairobi, Nairobi, Kenya
| | - Kristina Roesel
- Animal and Human Health Program, International Livestock Research Institute, Nairobi, Kenya
- Institute for Parasitology and Tropical Veterinary Medicine, Freie Universität Berlin, Berlin, Germany
| | - Lian Thomas
- Animal and Human Health Program, International Livestock Research Institute, Nairobi, Kenya
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Lea Hurst Campus, Neston, United Kingdom
| |
Collapse
|
6
|
Lobo FD, Vatsala KB, A S DA, Rai S. Cysts that Still Persist: A Case Series of Cysticercosis on Histopathological Evaluation. Turk Patoloji Derg 2021; 37:254-257. [PMID: 33432558 PMCID: PMC10510602 DOI: 10.5146/tjpath.2020.01518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 10/14/2020] [Indexed: 11/18/2022] Open
Abstract
Cysticercus is the infective larval form of the cystode T. solium that causes cysticercosis. It is has been declared as one of the neglected endemic zoonoses by the WHO. Poor sanitation, and consumption of undercooked infected pork and raw vegetables contaminated by human feces are the potential sources. Cysticercosis can affect various organs. India is one of the endemic countries where the parasite is prevalent in many states. This study aimed to analyze and report cases of cysticercosis based on the histopathological diagnosis. This is a retrospective study that included cases which had been reported as cysticercosis on histopathology from 2010 to 2018 at a tertiary care hospital. The clinical presentation of these cases along with macroscopic and microscopic features were reviewed. There were six cases of cysticercosis that were diagnosed on histopathology during the study period. Among them, two cases were intramuscular lesions, three were subcutaneous, and one case was an intraventricular lesion in the brain. Three of the cases presented as cystic lesions. On histopathological evaluation, cysts were identified in four cases on macroscopy. Microscopically, the cross section of the cysticercus was seen in all six cases with associated inflammatory change. To conclude, cysticercosis can clinically present as a benign neoplastic or an inflammatory lesion. Microscopic findings dictate the diagnosis of cysticercosis, although histopathological evaluation is not common.
Collapse
Affiliation(s)
- Flora D Lobo
- Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Kudurugundi Basavaraju Vatsala
- Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Deepa Adiga A S
- Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Sharada Rai
- Department of Pathology, Kasturba Medical College, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India
| |
Collapse
|
7
|
Marinho GLDOC, Schwarz DGG, Trigo BB, Nunes CM, Romeiro ET, de Azevedo EO, da Silva JEM, Farias MPO, Oliveira JF, Faustino MADG. Swine cysticercosis and associated risk factors in non-technified pig breeding in semi-arid region of Sergipe state, Brazil. Trop Anim Health Prod 2020; 53:37. [PMID: 33230578 DOI: 10.1007/s11250-020-02441-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 10/14/2020] [Indexed: 11/26/2022]
Abstract
The aim of this study was to determine the frequency of Taenia solium anti-metacestode antibodies in slaughtered pigs in a semi-arid region of the "Alto Sertão" of Sergipe state, Brazil, and verify the risk factors associated with swine cysticercosis. For this, 230 samples of swine blood from two slaughterhouses were collected and analyzed by indirect ELISA. The pigs came from five non-technical properties in the semi-arid region of the Alto Sertão of Sergipe state. Searches for cysts in the skeletal muscles of the pigs were performed during slaughter. In addition, an epidemiological questionnaire was applied to the pigs' original properties to determine risk factors. Besides that, the official health services database was evaluated for confirmed cases of neurocysticercosis and taeniasis in humans in the last 5 years, living in the studied region. Seropositivity in pigs was 12.6%, with no significant difference between males and females. No cysts were found in the carcasses of the slaughtered pigs. A positive association was found for properties that discharge domestic sewage into the environment, in river or streams, increasing the risk of positivity by 5.72 times. When analyzing the database of official agencies, there were no records of cases of neurocysticercosis or taeniasis in the resident population in the last 5 years. However, there were frequent cases of idiopathic epilepsy. The results demonstrate that study area is endemic for swine cysticercosis and serves as a warning of the possibility of the occurrence of the taeniasis-cysticercosis complex.
Collapse
Affiliation(s)
- Glenda Lídice de O C Marinho
- Veterinary Medicine, Universidade Federal do Piauí (UFPI), Campus Professora Cinobelina Elvas (CPCE), Bom Jesus, PI, Brazil.
| | - David Germano G Schwarz
- Veterinary Medicine, Universidade Federal do Piauí (UFPI), Campus Professora Cinobelina Elvas (CPCE), Bom Jesus, PI, Brazil
| | - Beatriz B Trigo
- Faculdade de Medicina Veterinária, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Aracatuba, SP, Brazil
| | - Caris M Nunes
- Faculdade de Medicina Veterinária, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Aracatuba, SP, Brazil
| | - Edenilze T Romeiro
- Department of Veterinary Medicine, Universidade Federal Rural de Pernambuco (UFRPE), Recife, PE, Brazil
| | | | | | - Márcia Paula O Farias
- Veterinary Medicine, Universidade Federal do Piauí (UFPI), Campus Professora Cinobelina Elvas (CPCE), Bom Jesus, PI, Brazil
| | - Juliana F Oliveira
- Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais, IFMG - Campus Avançado Ponte Nova, Ponte Nova, Minas Gerais, Brazil
| | | |
Collapse
|
8
|
Hobbs EC, Mwape KE, Phiri AM, Mambwe M, Mambo R, Thys S, Zulu G, Chembensofu M, Trevisan C, Van Damme I, Phiri IK, Devleesschauwer B, Ketzis J, Dorny P, Willingham AL, Gabriël S. Perceptions and acceptability of piloted Taenia solium control and elimination interventions in two endemic communities in eastern Zambia. Transbound Emerg Dis 2020; 67 Suppl 2:69-81. [PMID: 31231968 PMCID: PMC7496623 DOI: 10.1111/tbed.13214] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 04/04/2019] [Accepted: 04/08/2019] [Indexed: 12/23/2022]
Abstract
Infections with Taenia solium cause significant public health and economic losses worldwide. Despite effective control tools, long-term sustained control/elimination of the parasite has not been demonstrated to date. Success of intervention programs is dependent on their acceptability to local communities. Focus group discussions (FGDs) and questionnaires (QS) were conducted in two study communities in eastern Zambia to assess local perceptions and acceptance of two piloted intervention strategies: one targeting pigs only ('control' study arm), and one integrated human- and pig-based ('elimination') strategy. QS (n = 227) captured data regarding participation in project activities, knowledge and perceptions of T. solium and of the interventional drugs used in the study. FGDs (n = 18) discussed perceived advantages and disadvantages of the interventions and of the project's delivery and value. QS data revealed 67% of respondents participated in at least one educational activity, and 80% correctly identified at least one disease targeted by the education. All elimination study arm respondents (n = 113) had taken the human treatment, and 98% intended to do so next time. Most (70%) indicated willingness to pay for future treatments (median 0.20 USD per dose). Of pig-owning respondents, 11/12 (92%) had allowed their pigs to be treated/vaccinated and all intended to do so again next time. Four pig owners indicated willingness to pay 0.10-0.50 USD per dose of treatment or vaccine. FGD feedback revealed positive perceptions of interventions; people reported improved health in themselves and their pigs, and fewer cysticerci in pork. Latrine use, hand washing, meat inspection and proper cooking of pork had reportedly increased since the program's inception. Preliminary assessment indicates that the piloted intervention methods are generally acceptable to the communities. The reported willingness of many respondents to pay for the medications would contribute to the feasibility of long-term, government-led T. solium intervention programs in future.
Collapse
Affiliation(s)
- Emma Clare Hobbs
- One Health Center for Zoonoses and Tropical Veterinary MedicineRoss University School of Veterinary MedicineSaint KittsWest Indies
- Institute of Tropical MedicineAntwerpBelgium
- Faculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | | | - Andrew M. Phiri
- School of Veterinary MedicineUniversity of ZambiaLusakaZambia
| | - Moses Mambwe
- Ministry of HealthGovernment of the Republic of ZambiaLusakaZambia
| | - Richard Mambo
- Ministry of HealthGovernment of the Republic of ZambiaLusakaZambia
| | | | - Gideon Zulu
- Ministry of HealthGovernment of the Republic of ZambiaLusakaZambia
| | | | | | - Inge Van Damme
- Faculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | | | | | - Jennifer Ketzis
- One Health Center for Zoonoses and Tropical Veterinary MedicineRoss University School of Veterinary MedicineSaint KittsWest Indies
| | - Pierre Dorny
- Institute of Tropical MedicineAntwerpBelgium
- Faculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| | - Arve Lee Willingham
- One Health Center for Zoonoses and Tropical Veterinary MedicineRoss University School of Veterinary MedicineSaint KittsWest Indies
| | - Sarah Gabriël
- Faculty of Veterinary MedicineGhent UniversityMerelbekeBelgium
| |
Collapse
|
9
|
Parkhouse RME, Rojas R G, Aguilar CM, Medina C, Ferrer E, Cortez Alcovedes MM. Diagnosis of Taeniosis in rural Venezuelan communities: Preliminary characterization of a Taenia solium specific monoclonal (VP-1) Coproantigen ELISA. Acta Trop 2020; 207:105445. [PMID: 32224076 DOI: 10.1016/j.actatropica.2020.105445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Revised: 03/12/2020] [Accepted: 03/13/2020] [Indexed: 11/17/2022]
Abstract
The objective of this study was to identify and treat carriers of adult Taenia solium present in two rural Venezuelan communities through examination of faecal samples by coproscopical analysis, and by the application of a polyclonal and a monoclonal (VP-1) coproantigen ELISA. Both the polyclonal and monoclonal ELISA's were negative when tested with soluble extracts of adults of Ascaris lumbricoides, Hymenolepis nana and Trichuris trichura. The polyclonal ELISA was positive for soluble extracts adults of T. solium and T. saginata, whereas the monoclonal ELISA, which recognizes a glycoprotein, was restricted to T. solium, and was also negative with faecal samples from five cases of T. saginata adult infections. In the first community studied, Potrero Largo (Total population: 300), of 248 faecal samples examined, 2 individuals were positive for Taenia spp eggs by coproscopical analysis and the VP-1 ELISA, and yielded T. solium adults upon purging. In contrast, when the polyclonal coproAg ELISA was applied to the same 248 faecal samples, there were a considerable number of positives. Indeed, seven patients highly positive in the polyclonal ELISA did not yield a Taenia spp upon purging and were negative in the VP-1 ELISA. In the second community studied La Yuca (Total population 560), none of the 333 individuals who donated faeces was positive for Taenia spp eggs. Many, however, were infected with a range of intestinal helminth and protozoan parasites. A total of 76 faecal samples with representative intestinal parasite were then tested in the polyclonal and VP-1 assays. Of these, many gave an unacceptable number of significant optical densities in the polyclonal coproAg ELISA. In contrast, all were negative in the VP-1 ELISA, thus providing evidence for the species specificity of the VP-1 ELISA in faecal samples. These results with the VP-1 coproAg ELISA, although preliminary, justify further validation through the testing of more faecal samples from T. solium and T. saginata adult infected individuals.
Collapse
Affiliation(s)
- R Michael E Parkhouse
- Institute Gulbenkian de Ciencia. Rua Quinta Grande 6, PO box 14, CP 2780-156 Oeiras, Portugal.
| | - Glenda Rojas R
- Instituto de Investigaciones Biomédicas "Dr. Francisco J. Triana-Alonso", (BIOMED-UC) Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Av. Las Delicias, Maracay, PO Box: 2351, Aragua, Venezuela; Dpto. Clínico-Integral. Escuela de Bioanálisis, Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Maracay, Venezuela
| | - Cruz Manuel Aguilar
- Centro de Investigaciones de Enfermedades Tropicales (CIET-UC), Facultad de Ciencias de la Salud, Universidad de Carabobo. San Carlos, Cojedes. Venezuela
| | - Claudio Medina
- Instituto de Investigaciones Biomédicas "Dr. Francisco J. Triana-Alonso", (BIOMED-UC) Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Av. Las Delicias, Maracay, PO Box: 2351, Aragua, Venezuela
| | - Elizabeth Ferrer
- Instituto de Investigaciones Biomédicas "Dr. Francisco J. Triana-Alonso", (BIOMED-UC) Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Av. Las Delicias, Maracay, PO Box: 2351, Aragua, Venezuela; Dpto. Parasitología. Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Maracay, Aragua, Venezuela
| | - Maria M Cortez Alcovedes
- Instituto de Investigaciones Biomédicas "Dr. Francisco J. Triana-Alonso", (BIOMED-UC) Facultad de Ciencias de la Salud, Sede Aragua, Universidad de Carabobo, Av. Las Delicias, Maracay, PO Box: 2351, Aragua, Venezuela
| |
Collapse
|
10
|
Romo ML, Hernández M, Astudillo OG, Diego G, de-la-Rosa-Arana JL, Meza-Lucas A, García-Rodea R, Toledo A, Parkhouse RME, Garate T, Sciutto E, Fleury A. Diagnostic value of glycoprotein band patterns of three serologic enzyme-linked immunoelectrotransfer blot assays for neurocysticercosis. Parasitol Res 2020; 119:2521-2529. [PMID: 32591864 DOI: 10.1007/s00436-020-06750-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Accepted: 06/02/2020] [Indexed: 11/27/2022]
Abstract
The enzyme-linked immunoelectrotransfer blot (EITB) assay to detect antibodies in serum is a complementary tool for the diagnosis of neurocysticercosis (NCC). Presence of at least one glycoprotein band corresponding to a Taenia solium (T. solium) antigen indicates a positive result; however, EITB assays have multiple glycoprotein bands, and previous work has suggested that band patterns may have additional diagnostic value. We included 58 participants with a definitive diagnosis of NCC who received care at the Instituto Nacional de Neurología y Neurocirugía in Mexico City. Three different EITB tests were applied to participants' serum samples (LDBio, France; US Centers for Disease Control and Prevention [CDC]; and Instituto de Diagnóstico y Referencia Epidemiológicos [InDRE]). There was substantial variability in specific glycoprotein band patterns among the three assays. However, in age- and sex-adjusted logistic regression models, the number of glycoprotein bands was positively associated with the presence of vesicular extraparenchymal cysts (InDRE adjusted odds ratio [aOR] 1.60 p < 0.001; CDC aOR 6.31 p < 0.001; LDBio aOR 2.45 p < 0.001) and negatively associated with the presence of calcified parenchymal cysts (InDRE aOR 0.63 p < 0.001; CDC aOR 0.25 p < 0.001; LDBio aOR 0.44 p < 0.001). In a sensitivity analysis also adjusting for cyst count, results were similar. In all three EITB serum antibody tests, the number of glycoprotein bands consistently predicted cyst stage and location, although magnitude of effect differed.
Collapse
Affiliation(s)
- Matthew L Romo
- CUNY Graduate School of Public Health and Health Policy and Institute for Implementation Science in Population Health, City University of New York, New York, NY, 10027, USA.
- School of Public Health, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, Hong Kong SAR.
| | - Marisela Hernández
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Osvaldo-Germán Astudillo
- Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) "Dr. Carlos Malbrán", Buenos Aires, Argentina
| | - Gustavo Diego
- Administración Nacional de Laboratorios e Institutos de Salud (ANLIS) "Dr. Carlos Malbrán", Buenos Aires, Argentina
| | | | - Antonio Meza-Lucas
- Instituto de Diagnóstico y Referencia Epidemiológicos (InDRE), Secretaria de Salud, Mexico City, Mexico
| | - Ricardo García-Rodea
- Instituto de Diagnóstico y Referencia Epidemiológicos (InDRE), Secretaria de Salud, Mexico City, Mexico
| | - Andrea Toledo
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México/Instituto Nacional de Neurología y Neurocirugía/Facultad de Medicina-Universidad Nacional Autónoma de México, Mexico City, Mexico
| | | | - Teresa Garate
- Instituto de Salud Carlos III, Majadahonda, Madrid, Spain
| | - Edda Sciutto
- Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - Agnès Fleury
- Unidad de Neuroinflamación, Instituto de Investigaciones Biomédicas-Universidad Nacional Autónoma de México/Instituto Nacional de Neurología y Neurocirugía/Facultad de Medicina-Universidad Nacional Autónoma de México, Mexico City, Mexico.
- Neurocysticercosis Clinic, Instituto Nacional de Neurología y Neurocirugía, Mexico City, Mexico.
| |
Collapse
|
11
|
Al-Awadhi M, Iqbal J, Ahmad S. Cysticercosis, a Potential Public Health Concern in Kuwait: A New Diagnostic Method to Screen Taenia solium Taeniasis Carriers in the Expatriate Population. Med Princ Pract 2020; 29:347-353. [PMID: 31698357 PMCID: PMC7445651 DOI: 10.1159/000504625] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 11/04/2019] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE Taenia solium infection is not endemic to Kuwait, butseveral casesof cysticercosis have been detected in Kuwaiti nationals with no history of travelling to endemic countries. Infected domestic helpers/food handlers from endemic countries who may have escaped detection of infection by microscopy at the time of their arrival in Kuwait have been suspected as the possible source of infection. This study determined the seroprevalence of T. solium among domestic helpers/food handlers by screening their blood using a sensitive taeniasis-specific anti-rES33 antibody assay. SUBJECTS AND METHODS Newly arrived domestic helpers (n = 500) and food handlers (n = 500) from endemic countries were enrolled in the period 2015-2017. T. solium-specific rES33 antigen was expressed and purified from human embryonic kidney (HEK)293-6E cells using the pTT5 mammalian expression vector. Stool samples were processed for microscopy, and blood samples were screened to detect anti-T. soliumtaeniasis-specific IgG antibodies by ELISA. RESULTS All stool samples were negative for T. soliumparasiteeggs by microscopy. However, 42 individuals (4.2%) tested positive for T. soliumtaeniasis-specific IgG antibodies. Though statistically not significant, the IgG seropositivity was higher in individuals with a lower education level, a low-income background, and a lower frequency of hand-washing. CONCLUSIONS This is the first report from Kuwait and the Middle East on the detection of anti-T. soliumtaeniasis-specific serum IgG antibodies among the high-risk expatriate population. The results emphasize the importance of efficient and sensitive screening of T. solium carriers and thus the prevention of infection transmission and development of cysticercosis in the local population.
Collapse
Affiliation(s)
- Mohammad Al-Awadhi
- Department of Microbiology, Faculty of Medicine, Kuwait University, Safat, Kuwait
| | - Jamshaid Iqbal
- Department of Microbiology, Faculty of Medicine, Kuwait University, Safat, Kuwait,
| | - Suhail Ahmad
- Department of Microbiology, Faculty of Medicine, Kuwait University, Safat, Kuwait
| |
Collapse
|
12
|
Schmidt V, O’Hara MC, Ngowi B, Herbinger KH, Noh J, Wilkins PP, Richter V, Kositz C, Matuja W, Winkler AS. Taenia solium cysticercosis and taeniasis in urban settings: Epidemiological evidence from a health-center based study among people with epilepsy in Dar es Salaam, Tanzania. PLoS Negl Trop Dis 2019; 13:e0007751. [PMID: 31809501 PMCID: PMC6897529 DOI: 10.1371/journal.pntd.0007751] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 09/05/2019] [Indexed: 01/11/2023] Open
Abstract
In Africa, urbanization is happening faster than ever before which results in new implications for transmission of infectious diseases. For the zoonotic parasite Taenia solium, a major cause of acquired epilepsy in endemic countries, the prevalence in urban settings is unknown. The present study investigated epidemiological, neurological, and radiological characteristics of T. solium cysticercosis and taeniasis (TSCT) in people with epilepsy (PWE) living in Dar es Salaam, Tanzania, one of the fastest growing cities worldwide. A total of 302 PWE were recruited from six health centers in the Kinondoni district of Dar es Salaam. Serological testing for T. solium cysticercosis-antigen (Ag) and -antibodies (Abs) and for T. solium taeniasis-Abs was performed in all PWE. In addition, clinical and radiological examinations that included cranial computed tomography (CT) were performed. With questionnaires, demographic data from study populations were collected, and factors associated with TSCT were assessed. Follow-up examinations were conducted in PWE with TSCT. T. solium cysticercosis-Ag was detected in three (0.99%; 95% CI: 0–2.11%), -Abs in eight (2.65%; 95% CI: 0.84–4.46%), and taeniasis-Abs in five (1.66%; 95% CI: 0.22–3.09%) of 302 PWE. Six PWE (1.99%; 95% CI: 0.41–3.56%) were diagnosed with neurocysticercosis (NCC). This study demonstrates the presence of TSCT in Dar es Salaam, however, NCC was only associated with a few cases of epilepsy. The small fraction of PWE with cysticercosis- and taeniasis-Abs may suggest that active transmission of T. solium plays only a minor role in Dar es Salaam. A sufficiently powered risk analysis was hampered by the small number of PWE with TSCT; therefore, further studies are required to determine the exact routes of infection and risk behavior of affected individuals. Taenia solium cysticercosis and taeniasis is a zoonotic disease complex which affects thousands of people in sub-Saharan Africa. This parasite has a human-pig life cycle and has been considered a public health problem mainly in rural areas. As African towns and suburbs grow rapidly and disproportionally, adequate infrastructure such as sewage systems and clean water often lack while population density, trade, and travel increase. This may lead to the appearance of parasitic diseases formerly considered `rural´ in urban settings. In this study, we searched for evidence of T. solium infections in the Kinondoni district of Dar es Salaam, Tanzania. We focused on people with epilepsy (PWE) since epilepsy is one of the most common and severe disorders associated with T. solium neurocysticercosis and tested all of them serologically for T. solium cysticercosis and taeniasis. We further investigated neurological and radiological characteristics. Our findings show that in our study area in Dar es Salaam 2.65% of PWE had contracted T. solium infection at some stage. Neurocysticercosis, as confirmed by neuroimaging, was found only in 1.99% of PWE. This, in combination with the relatively small number of PWE detected with taeniasis antibodies (1.66%), points towards the fact that active transmission of T. solium seems to play only a minor role in this urban setting, suggesting that infections may mainly be contracted in rural areas. Further large-scale studies are required to investigate the infection pathways and risk behavior related to T. solium infections within urban areas of sub-Saharan Africa.
Collapse
Affiliation(s)
- Veronika Schmidt
- Department of Neurology, Center for Global Health, School of Medicine, Technical University of Munich, Munich, Germany
- Centre for Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
- * E-mail:
| | - Marie-Claire O’Hara
- Department of Neurology, Center for Global Health, School of Medicine, Technical University of Munich, Munich, Germany
- Department of Neurology, Elbe Klinikum Stade, Stade, Germany
| | - Bernard Ngowi
- Muhimbili Medical Research Centre, National Institute for Medical Research (NIMR), Dar es Salaam, Tanzania
- College of Health and Allied Sciences, University of Dar es Salaam, Dar es Salaam, Tanzania
| | - Karl-Heinz Herbinger
- Division of Infectious Diseases and Tropical Medicine (DITM), Medical Center of the University of Munich, Ludwig-Maximilians-University Munich, Munich, Germany
| | - John Noh
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America
| | - Patricia Procell Wilkins
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention (CDC), Atlanta, Georgia, United States of America
| | - Vivien Richter
- Department of Neurology and Epileptology, Evangelical Hospital Alsterdorf, Hamburg, Germany
| | - Christian Kositz
- Department of Internal Medicine, Kantonsspital St. Gallen, St. Gallen, Schwitzerland
| | - William Matuja
- Department of Neurology, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - Andrea Sylvia Winkler
- Department of Neurology, Center for Global Health, School of Medicine, Technical University of Munich, Munich, Germany
- Centre for Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
| |
Collapse
|
13
|
Cruz-Rivera M, Torres J, Carrillo-Farga J, Wilkins PP, Flisser A, Mendlovic F. Distribution of Taenia solium Diagnostic Glycoproteins in the Different Developmental Stages of the Parasite. J Parasitol 2019; 105:642-650. [PMID: 31436487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023] Open
Abstract
Taenia solium is a helminth parasite that causes 2 diseases in humans: cysticercosis and taeniasis. The establishment of T. solium metacestodes in the central nervous system causes neurocysticercosis, while development of the adult tapeworm in the small intestine causes taeniasis. Serological diagnosis of neurocysticercosis is performed by Western blot with an enriched fraction of glycoproteins that has been extensively used for clinical diagnosis and epidemiological surveys. The lectin-bound fraction that is used for this assay contains 7 antigenic glycoproteins. These antigenic proteins are considered to be highly specific for cysticercosis when tested with heterologous parasitic diseases. However, recent studies show that people with taeniasis have cross-reactive antibodies against the neurocysticercosis diagnostic glycoproteins and vice versa. Nevertheless, it is not known if these diagnostic proteins are expressed in the adult stage of the parasite. In this paper, we describe the location of 3 of these glycoproteins in T. solium adults and cysticerci using polyclonal antibodies raised against a synthetic peptide based on the amino acid sequence of TS14, a recombinant protein T24H, and the native GP50. The glycoproteins' distribution was different in invaginated and evaginated cysticerci as well as in adult tapeworms. Specifically, the 3 glycoproteins studied were differentially expressed during embryogenesis. Our findings indicate that expression of the diagnostic glycoproteins is developmentally regulated; this is noteworthy since these glycoproteins are considered specific for the diagnosis of neurocysticercosis but nevertheless are present in different structures throughout the development of T. solium. Here we describe the glycoprotein expression and localization, which can be important in understanding their biological functions. In addition, our results help clarify the cross-reaction observed between people with neurocysticercosis and taeniasis to TS14, T24H, and GP50, which are used as diagnostic antigens for neurocysticercosis.
Collapse
Affiliation(s)
- M Cruz-Rivera
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad de Mexico 04510, Mexico
| | - J Torres
- Instituto de Hematopatología, Calle Dr. Ruy Pérez Tamayo 26, Purísima de Cubos, Mpio. de Colón, Queretaro 76290, Mexico
| | - J Carrillo-Farga
- Instituto de Hematopatología, Calle Dr. Ruy Pérez Tamayo 26, Purísima de Cubos, Mpio. de Colón, Queretaro 76290, Mexico
| | - P P Wilkins
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, 1600 Clifton Rd, Atlanta, Georgia 30333
- Present address: Parasitology Services, Marathon, 5409 Overseas Hwy, Ste 238, Marathon, Florida 33050-2710
| | - A Flisser
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad de Mexico 04510, Mexico
| | - F Mendlovic
- Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad Nacional Autónoma de México, Av. Universidad 3000, Ciudad de Mexico 04510, Mexico
- Facultad de Ciencias de la Salud, Universidad Anahuac, Mexico Norte, Av. Universidad Anahuac 46, Huixquilucan 52786, Estado de Mexico, Mexico
| |
Collapse
|
14
|
Assana E, Awah-Ndukum J, Djonmaïla JD, Djiatche HD, Awé C, Manchang TK, Zoli AP. A comparison of Taenia solium and Taenia hydatigena infection in pigs using serological diagnosis and post-mortem inspection methods in Benoué division, North Cameroon. Vet Parasitol Reg Stud Reports 2019; 17:100306. [PMID: 31303222 DOI: 10.1016/j.vprsr.2019.100306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 05/25/2019] [Accepted: 05/25/2019] [Indexed: 11/19/2022]
Abstract
The metacestodes of Taenia solium and Taenia hydatigena are the cause of cysticercosis in pigs. T. solium is also responsible of the taeniosis/neurocysticercosis complex in humans, constituting a main cause of epilepsy cases across endemic countries. T. hydatigena is non-zoonotic, but its occurrence in pigs contributes significantly to false positive reactions should genus-species serological methods be used for diagnosis of T. solium porcine cysticercosis. T. hydatigena is often considered not common in pigs in Africa compared to T. solium. On the basis of the evidence that these two cestodes coexist in Cameroon, we examined the viscera of 305 pigs for the identification of the metacestodes of T. hydatigena in Bénoué division, North Region of Cameroon. Tongue, masticatory muscles and heart were sliced for the identification of T. solium cysticerci (TMH dissection test). Twenty seven (8.85%) and 16 (5.24%) pigs were found infected with the metacestodes of T. solium and T. hydatigena, respectively. The difference between the two rates of infection was not statistically significant (P > 0.05). Serum samples were also collected for the evaluation of an inhibition ELISA (i-ELISA) specific to antibodies anti- T. solium or anti-T. hydatigena cysticerci. After incubation of these sera with cyst fluid of T. solium, T. hydatigena, T. multiceps multiceps, T. multiceps gaigeri and T. saginata to eliminate cross-reactions among cestodes parasites, the i-ELISA indicated that 26.56% and 28.52% slaughtered pigs had predominant specific antibodies to cyst fluid of T. solium and T. hydatigena, respectively. Combination of TMH dissection test, i-ELISA and a standard indirect ELISA in a Bayesian simulation approach revealed a true prevalence of 19.27% (0.7-49.27, CI 95%) and 24.85% (5.17-48.34, CI 95%) of porcine cysticercosis due to T. solium and T. hydatigena, respectively. These results indicated that T. hydatigena is as prevalent as T. solium in pigs in the North of Cameroon.
Collapse
Affiliation(s)
- Emmanuel Assana
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon. e.assana@-ndere.cm
| | - Julius Awah-Ndukum
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon
| | - Justin D Djonmaïla
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon
| | - Hidrice D Djiatche
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon
| | - Charles Awé
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon
| | - T K Manchang
- Institute of Agricultural Research for Development, Veterinary Research Laboratory, Wakwa Regional Centre, P.O. Box 65, Ngaoundere, Cameroon
| | - André P Zoli
- University of Ngaoundéré, School of Veterinary Medicine and Sciences, P.O. Box 454, Ngaoundéré, Cameroon
| |
Collapse
|
15
|
Adesokan HK, Adeoye FA. Porcine cysticercosis in slaughtered pigs and factors related to Taenia solium transmission amongst abattoir workers in Ibadan, Nigeria. Pan Afr Med J 2019; 32:145. [PMID: 31308860 PMCID: PMC6610151 DOI: 10.11604/pamj.2019.32.145.10695] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 07/18/2017] [Indexed: 11/11/2022] Open
Abstract
INTRODUCTION porcine cysticercosis is under-reported particularly in Nigeria, despite the reportedly high prevalence of epilepsy and associated life-threatening health implications. This study was aimed at determining the prevalence of porcine cysticercosis and factors related to Taenia solium transmission to humans. METHODS slaughtered pigs at a major abattoir, south-western Nigeria were randomly inspected and questionnaire was administered to pig workers/consumers while the data were analysed using Stata 12.0. RESULTS a 4.4% (11/250) prevalence of porcine cysticercosis was obtained; the age, breed, sex and body conditions of pigs were not significant for infection (p < 0.05). Further, none (0.0%) of the respondents knew that T. solium could cause epilepsy in man and 39.5% often defaecated on neighbouring open fields and farmlands. Respondents purchasing pork from home slaughter were about four and ten times less likely to demonstrate good knowledge (OR = 0.24; 95% CI: 0.08-0.74) and practice (OR = 0.10; 95% CI: 0.05-0.22) than those purchasing from abattoir. Moreover, those lacking toilet facility were about four and five times less likely to demonstrate good knowledge (OR = 0.24; 95% CI: 0.07-0.86) and practice (OR = 0.19; 95% CI: 0.08-0.45) than those who had it. Other factors associated with practices related to T. solium transmission included age (p = 0.000), sex (p = 0.000) and duration (p = 0.003). CONCLUSION the increased odds of poor knowledge and practices related to Taenia solium transmission especially among respondents purchasing home slaughter pork and lacking toilet facility provides insights into the parasite epidemiology. Above findings are important in lowering the infection prevalence in pigs and humans in this endemic area.
Collapse
Affiliation(s)
- Hezekiah Kehinde Adesokan
- Department of Veterinary Public Health and Preventive Medicine, University of Ibadan, Ibadan, Nigeria
| | | |
Collapse
|
16
|
Affiliation(s)
- Yoon Kong
- Department of Molecular Parasitology, Sungkyunkwan University School of Medicine, Suwon 16419, Korea
| |
Collapse
|
17
|
Fernandez L, Gamboa R, Vilchez P, Pray I, Beam M, Garvey B, Spencer A, Atto R, Muro C, Moyano LM, Garcia HH, O’Neal SE. Evaluating Urban Taeniasis as a Threat to Cysticercosis Elimination in Northern Peru. Am J Trop Med Hyg 2019; 100:140-142. [PMID: 30457096 PMCID: PMC6335904 DOI: 10.4269/ajtmh.18-0767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 10/15/2018] [Indexed: 11/07/2022] Open
Abstract
Reintroduction of Taenia solium into a region in Peru where it had been eliminated prompted evaluation of the possibility of reintroduction from an urban reservoir of taeniasis. In a cross-sectional study of an adjacent urban area, we found low prevalence of taeniasis (4/1,621; 0.25%), suggesting minimal risk of parasite reintroduction into rural areas through this route.
Collapse
Affiliation(s)
- Lauralee Fernandez
- Oregon Health & Science University, Portland, Oregon
- Portland State University, Portland, Oregon
| | | | | | - Ian Pray
- Oregon Health & Science University, Portland, Oregon
- Portland State University, Portland, Oregon
| | - Michelle Beam
- Oregon Health & Science University, Portland, Oregon
| | - Brian Garvey
- Oregon Health & Science University, Portland, Oregon
| | - Angela Spencer
- Oregon Health & Science University, Portland, Oregon
- Portland State University, Portland, Oregon
| | - Ruth Atto
- Centro de Salud Global, Tumbes, Tumbes, Peru
| | | | | | - Hector H. Garcia
- Centro de Salud Global, Tumbes, Tumbes, Peru
- Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Seth E. O’Neal
- Oregon Health & Science University, Portland, Oregon
- Portland State University, Portland, Oregon
- Centro de Salud Global, Tumbes, Tumbes, Peru
| | - for the Cysticercosis Working Group in Peru
- Oregon Health & Science University, Portland, Oregon
- Portland State University, Portland, Oregon
- Centro de Salud Global, Tumbes, Tumbes, Peru
- Universidad Peruana Cayetano Heredia, Lima, Peru
| |
Collapse
|
18
|
Satyaprakash K, Khan WA, Chaudhari SP, Shinde SV, Kurkure NV, Kolte SW. Pathological and molecular identification of porcine cysticercosis in Maharashtra, India. Acta Parasitol 2018; 63:784-790. [PMID: 30367761 DOI: 10.1515/ap-2018-0094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 08/07/2018] [Indexed: 11/15/2022]
Abstract
Porcine cysticercosis, caused by metacestodes of Taenia solium is an important emerging zoonotic disease with public health and economic significance. Pigs acquire the disease through consumption of Taenia solium eggs excreted by human tapeworm carriers. The present study was conducted to investigate the prevalence of porcine cysticercosis in Nagpur and Mumbai region of Maharashtra, India by P/M examination of carcasses followed by histopathology of affected organs in infected animals and molecular identification of cysts for confirmation. Out of 1000 pigs examined during slaughter, three pigs were found to be heavily affected with T. solium cysts giving a prevalence of 0.3%. Histological section of brain in infected animals revealed marked vascular congestion of meninges, mild neuronal degeneration, perivascular cuffing and gliosis while the liver showed the infiltration of mononuclear cell, predominantly eosinophils throughout the parenchyma. Some degree of calcification was observed in the cysts lodged in liver while calcification was not evident in case of cysts lodged in brain, tongue, diaphragm and skeletal muscle. Molecular identification by PCR using two sets of oligonucleotide primers against LSU rRNA gene and Mt-Cox1 gene of T. solium confirms the cysts to be that of T. solium. The molecular diagnostics methods have been considered for validation in conjunction with P/M inspections, parasitological and histopathological examinations. The study confirms the presence of porcine cysticercosis in the two regions and demands proper sanitary measures to minimize the risk of infection from zoonoses and food safety point of view.
Collapse
Affiliation(s)
- Kaushik Satyaprakash
- Department of Veterinary Public Health, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| | - Waqar A Khan
- Department of Veterinary Public Health, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| | - Sandeep P Chaudhari
- Department of Veterinary Public Health, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| | - Shilpshree V Shinde
- Department of Veterinary Public Health, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| | - Nitin V Kurkure
- Department of Veterinary Pathology, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| | - Sunil W Kolte
- Department of Veterinary Parasitology, Nagpur Veterinary College, Nagpur, Maharashtra 440006, India
| |
Collapse
|
19
|
José MV, Bobadilla JR, Sánchez-Torres NY, Laclette JP. Mathematical model of the life cycle of taenia-cysticercosis: transmission dynamics and chemotherapy (Part 1). Theor Biol Med Model 2018; 15:18. [PMID: 30449280 PMCID: PMC6241031 DOI: 10.1186/s12976-018-0090-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2018] [Accepted: 09/11/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Taenia solium is the aetiological agent of human taeniasis, pig cysticercosis and human neurocysticercosis, which are serious public health problems, especially in developing countries. METHODS A mathematical model of the transmission dynamics of taeniasis-cysticercosis is formulated. The model consists of a coupled system of differential equations, which are density-dependent equations for describing the flow of the parasite through the life cycle. The model is hybrid since it comprises deterministic equations with stochastic elements which describe changes in the mean parasite burden and incorporates the overall pattern of the parasites' distribution. RESULTS Sensitivity and bifurcation analyses were carried out to determine the range of values of the model. The model can reproduce the observed epidemiological patterns of human taeniasis, pig and human cysticercosis. For example, for a wide range of parameter values, the mean intensity of adult worms tends to rapidly stabilize in one parasite per individual host. From this model, we also derived a Susceptible-Infected model to describe the prevalence of infection in humans and pigs. Chemotherapeutic interventions against pig cysticercosis or human taeniasis may reduce rapidly and effectively the mean intensity of human taeniasis, pig cysticercosis and human cysticercosis. This effect can be achieved even if the protective efficacy of the drug is of the order of 90% and the coverage rate is 90%. This means that health in humans infected either with adult worms or cysticerci may be achieved by the application of anthelmintic drugs against pig cysticercosis. However, treatment against human cysticercosis alone, does not influence neither human teniasis nor pig cysticercosis. This is because human cysticercosis infection does not influence the value of the basic reproductive number (Ro). CONCLUSIONS Even coverage of 100% in the administration of anthelmintics did not eliminate the infection. Then elimination of the infection in all hosts does not seem a feasible goal to achieve by administering only chemotherapeutic interventions. Throughout the manuscript a discussion of our model in the context of other models of taeniasis-cysticercosis is presented.
Collapse
Affiliation(s)
- Marco V. José
- Theoretical Biology Group, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 CDMX, Mexico
| | - Juan R. Bobadilla
- Theoretical Biology Group, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 CDMX, Mexico
| | - Norma Y. Sánchez-Torres
- Theoretical Biology Group, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 CDMX, Mexico
| | - Juan Pedro Laclette
- Department of Immunology, Biomedical Research Institute, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 CDMX, Mexico
| |
Collapse
|
20
|
Singh SP, Singh BB, Kalambhe DG, Pathak D, Aulakh RS, Dhand NK. Prevalence and distribution of Taenia solium cysticercosis in naturally infected pigs in Punjab, India. PLoS Negl Trop Dis 2018; 12:e0006960. [PMID: 30439944 PMCID: PMC6264866 DOI: 10.1371/journal.pntd.0006960] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 11/29/2018] [Accepted: 10/30/2018] [Indexed: 11/25/2022] Open
Abstract
Background Taenia solium (T. solium) cysticercosis remains a neglected zoonotic disease in India. The current study was planned to estimate the prevalence of T. solium porcine cysticercosis in the Punjab state of India, to compare this prevalence with the disease prevalence in pigs reared outside Punjab and to assess the distribution of the parasite in pig carcasses. Methods Two slaughter shops were selected in each of the 22 districts of Punjab. Pigs slaughtered on the day/s of inspection were post-mortem inspected to identify the presence of T. solium cysts. Estimated true prevalence was estimated by taking into account the diagnostic sensitivity (38%) and specificity (100%) of post-mortem inspection using the Rogan-Gladen estimator. Positive carcasses were purchased and brought to the laboratory to assess the tissue distribution of T. solium cysts and to conduct PCR targeting large subunit rRNA gene, internal transcribed spacer 1 gene, ITS1 gene and Cytochrome oxidase I gene. The selected PCR products were submitted for sequencing and phylogenetic analyses were performed. Findings We contacted 71 shop owners to achieve a sample of 44 shops for the study. We inspected 642 pigs reared in Punjab and 450 imported from other states at these slaughter shops. In addition, we sampled 40 pigs from an abattoir located in the state capital. Of the 642 pigs reared in Punjab, 9 had T. solium cysts with an apparent prevalence of 1·40% (95% CI: 0·74%, 2·64%) and the estimated true prevalence of 3.69% (95% CI: 1·95%, 6·95%). Pigs imported from outside the state had a significantly higher prevalence (odds ratio: 2·58; 95% CI: 1·12, 5·98; p-value: 0·026) as 15 of the 450 imported pigs were positive (apparent prevalence: 3.33%; 95% CI: 2.03%, 5.43%; estimated true prevalence: 8.77%; 95% CI: 5.34%, 14.28%). None of samples was positive from the pigs sampled at the abattoir in the state capital. The PCR confirmed T. solium cysts from all the 24 positive samples. We counted a median of 897 (range 526–1964) cysts per infected pig from the 19 infected pig carcasses inspected. The phylogenetic tree based on the alignment of partial cytochrome oxidase 1 sequences indicated all positive samples to be clustered with the T. solium Asian genotype. The analysis did not indicate the presence of T. asiatica in the slaughter pigs. Conclusions Despite the underestimation of the prevalence due to missing mildly-infected carcasses, low participation and lack of representative sampling, the presence of heavily infected carcasses containing viable cysts, particularly those imported from outside the state, indicates that T. solium cysticercosis is an important food safety concern for pork consumers in Punjab, India. Measures should be taken to reduce the disease prevalence in pigs to reduce the disease burden in the public. Taenia solium cysticercosis is a neglected zoonosis and severely affects pork production and public health in India. The current study was conducted to estimate the prevalence and distribution of T. solium porcine cysticercosis in the Punjab state of India and to compare the disease prevalence in pigs reared within and outside Punjab. Overall, 24 of the 1132 inspected pigs had viable cysts. Imported pigs had significantly higher prevalence than the pigs produced locally. The analysis did not indicate the presence of T. asiatica in the slaughter pigs. The study confirms the endemic nature of T. solium cysticercosis in Punjab state of India and provides suggestions about reducing the disease burden in pigs and the public.
Collapse
Affiliation(s)
- Satinder Pal Singh
- School of Public Health & Zoonoses, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - Balbir Bagicha Singh
- School of Public Health & Zoonoses, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
- * E-mail:
| | - Deepali G. Kalambhe
- School of Public Health & Zoonoses, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - Devendra Pathak
- Department of Veterinary Anatomy, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - Rabinder Singh Aulakh
- School of Public Health & Zoonoses, Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana, Punjab, India
| | - Navneet K. Dhand
- Sydney School of Veterinary Science, The University of Sydney, Camden, NSW, Australia
| |
Collapse
|
21
|
Ng-Nguyen D, Traub RJ, Nguyen VAT, Breen K, Stevenson MA. Spatial distribution of Taenia solium exposure in humans and pigs in the Central Highlands of Vietnam. PLoS Negl Trop Dis 2018; 12:e0006810. [PMID: 30235251 PMCID: PMC6168177 DOI: 10.1371/journal.pntd.0006810] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 10/02/2018] [Accepted: 09/01/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Taenia solium, a pork-borne parasitic zoonosis, is the cause of taeniasis and cysticercosis in humans. In Vietnam, poor sanitation, the practice of outdoor defecation and consumption of raw/undercooked pork have been associated with infection/exposure to T. solium in both humans and pigs. The broad-scale geographic distribution of the prevalence of T. solium varies throughout the country with infection restricted to isolated foci in the north and a more sporadic geographic distribution in the Central Highlands and the south. While cross-sectional studies have allowed the broad-scale geographic distribution of T. solium to be described, details of the geographic distribution of T. solium at finer spatial scales have not been described in detail. This study provides a descriptive spatial analysis of T. solium exposure in humans and pigs and T. solium taeniasis in humans within individual households in village communities of Dak Lak in the Central Highlands of Vietnam. METHODOLOGY/PRINCIPAL FINDINGS We used Ripley's K-function to describe spatial dependence in T. solium exposure positive and negative human and pig households and T. solium taeniasis exposure positive and negative households in villages within the districts of Buon Don, Krong Nang and M'Drak of Dak Lak province in the Central Highlands of Vietnam. The prevalence of exposure to T. solium in pigs in Dak Lak province was 9 (95% CI 5 to 17) cases per 1000 pigs at risk. The prevalence of exposure to the parasite in humans was somewhat higher at 5 (95% CI 3 to 8) cases per 100 individuals at risk. Spatial aggregations of T. solium exposure-positive pig and human households occurred in some, but not all of the villages in the three study districts. Human exposure-positive households were found to be aggregated within a distance of 200 to 300 m in villages in Krong Nang district compared with distances of up to 1500 m for pig exposure-positive households in villages in M'Drak district. Although this study demonstrated the aggregation of households in which either T. solium exposure- or taeniasis-positive individuals were present, we were unable to identify an association between the two due to the very low number of T. solium taeniasis-positive households. CONCLUSIONS Spatial aggregations of T. solium exposure-positive pig and human households occurred in some, but not all of the villages in the three study districts. We were unable to definitively identify reasons for these findings but speculate that they were due to a combination of demographic, anthropological and micro-environmental factors. To more definitively identify characteristics that increase cysticercosis risk we propose that cross-sectional studies similar in design to that described in this paper should be applied in other provinces of Vietnam.
Collapse
Affiliation(s)
- Dinh Ng-Nguyen
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
- Faculty of Animal Sciences and Veterinary Medicine, Tay Nguyen University, Dak Lak, Vietnam
| | - Rebecca Justine Traub
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Van-Anh Thi Nguyen
- Faculty of Animal Sciences and Veterinary Medicine, Tay Nguyen University, Dak Lak, Vietnam
| | - Kathleen Breen
- Department of Livestock, Montana Veterinary Diagnostic Lab, Bozeman, Montana, United States of America
| | - Mark Anthony Stevenson
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
22
|
Openshaw JJ, Medina A, Felt SA, Li T, Huan Z, Rozelle S, Luby SP. Prevalence and risk factors for Taenia solium cysticercosis in school-aged children: A school based study in western Sichuan, People's Republic of China. PLoS Negl Trop Dis 2018; 12:e0006465. [PMID: 29738570 PMCID: PMC5959190 DOI: 10.1371/journal.pntd.0006465] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 05/18/2018] [Accepted: 04/19/2018] [Indexed: 12/16/2022] Open
Abstract
Background Taenia solium cysticercosis affects millions of impoverished people worldwide and can cause neurocysticercosis, an infection of the central nervous system which is potentially fatal. Children may represent an especially vulnerable population to neurocysticercosis, due to the risk of cognitive impairment during formative school years. While previous epidemiologic studies have suggested high prevalence in rural China, the prevalence in children as well as risk factors and impact of disease in low-resource areas remain poorly characterized. Methodology/Principal findings Utilizing school based sampling, we conducted a cross-sectional study, administering a questionnaire and collecting blood for T. solium cysticercosis antibodies in 2867 fifth and sixth grade students across 27 schools in west Sichuan. We used mixed-effects logistic regression models controlling for school-level clustering to study associations between risk factors and to characterize factors influencing the administration of deworming medication. Overall prevalence of cysticercosis antibodies was 6%, but prevalence was significantly higher in three schools which all had prevalences of 15% or higher. Students from households owning pigs (adjusted odds ratio [OR] 1.81, 95% CI 1.08–3.03), from households reporting feeding their pigs human feces (adjusted OR 1.49, 95% CI 1.03–2.16), and self-reporting worms in their feces (adjusted OR 1.85, 95% CI 1.18–2.91) were more likely to have cysticercosis IgG antibodies. Students attending high prevalence schools were more likely to come from households allowing pigs to freely forage for food (OR 2.26, 95% CI 1.72–2.98) and lacking a toilet (OR 1.84, 95% CI 1.38–2.46). Children who were boarding at school were less likely to have received treatment for gastrointestinal worms (adjusted OR 0.58, 95% CI 0.42–0.80). Conclusions/Significance Our study indicates high prevalences of cysticercosis antibodies in young school aged children in rural China. While further studies to assess potential for school-based transmission are needed, school-based disease control may be an important intervention to ensure the health of vulnerable pediatric populations in T. solium endemic areas. The zoonotic tapeworm, Taenia solium, affects millions of impoverished people worldwide and can cause neurocysticercosis (NCC), an infection of the central nervous system which is potentially fatal. Hypothetically, children may be a vulnerable population to infection as neurological problems and cognitive impairment caused by NCC during formative school years may lead to poor academic performance, contributing to drop-out rates and, eventually, propagating cycles of poverty. We carried out a school-based study of T. solium cysticerosis in primary school-aged children in rural western Sichuan. Our results indicate high levels of T. solium exposure in young school-aged children in rural China. While further studies to assess disease transmission within schools are needed, school-based disease control may be an important intervention to ensure the health of pediatric populations at risk for infection.
Collapse
Affiliation(s)
- John J. Openshaw
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA, United States of America
| | - Alexis Medina
- Freeman Spogli Institute, Stanford University, Stanford, CA, United States of America
| | - Stephen A. Felt
- Department of Comparative Medicine, Stanford University School of Medicine, Stanford, CA, United States of America
| | - Tiaoying Li
- Institute of Parasitic Diseases, Sichuan Centers for Disease Control and Prevention, Sichuan Province, Chengdu, Sichuan, People’s Republic of China
- * E-mail:
| | - Zhou Huan
- West China School of Public Health, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Scott Rozelle
- Freeman Spogli Institute, Stanford University, Stanford, CA, United States of America
| | - Stephen P. Luby
- Division of Infectious Diseases and Geographic Medicine, Department of Medicine, Stanford University, Stanford, CA, United States of America
| |
Collapse
|
23
|
Herrador Z, Fernandez-Martinez A, Benito A, Lopez-Velez R. Clinical Cysticercosis epidemiology in Spain based on the hospital discharge database: What's new? PLoS Negl Trop Dis 2018; 12:e0006316. [PMID: 29621234 PMCID: PMC5886389 DOI: 10.1371/journal.pntd.0006316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 02/14/2018] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Cysticercosis (CC) is a tissue infection caused by the larval cysts of the pork tapeworm Taenia solium. It is usually acquired by eating contaminated food or drinking water. CC Cysts can develop in the muscles, the eyes, the brain, and/or the spinal cord. T. solium is found worldwide, but its prevalence has decreased in developed countries due to stricter meat inspection and better hygiene and sanitation. Nevertheless, CC is still a leading cause of seizures and epilepsy. In Spain, The disease is not nationally reportable and data on CC infected animals are also missing, despite the European Directive 2003/99/EC. METHODOLOGY/PRINCIPAL FINDINGS We performed a retrospective descriptive study using the Spanish Hospitalization Minimum Data Set (CMBD). Data with ICD-9 CM cysticercosis code ("123.1") placed in first or second diagnostic position from 1997 to 2014 were analyzed. Hospitalization rates were calculated and clinical characteristics were described. Spatial distribution of cases and their temporal behavior were also assessed. A total of 1,912 hospital discharges with clinical cysticercosis were identified. From 1998 to 2008, an increasing trend in the number of CC hospitalizations was observed, decreasing afterwards, in parallel with a decrease in the external migration rate. The Murcia region had the highest median hospitalization rate (13.37 hospitalizations/100,000 population), followed by Navarra and Madrid. The 16-44 age group was the most represented (63.6%). The three most frequent associated diagnoses were epilepsy and convulsions (49.5%), hydrocephalus (11.8%) and encephalitis/myelitis/meningitis (11.6%). CONCLUSIONS/SIGNIFICANCE There is a need for a common strategy on data collection, monitoring and reporting, which would facilitate a more accurate picture on the CC epidemiological scenario. Even if most cases might be imported, improving the human and animal CC surveillance will result useful both in gaining extended disease knowledge and reducing morbidity and related-costs.
Collapse
Affiliation(s)
- Zaida Herrador
- National Centre for Tropical Medicine, Health Institute Carlos III (ISCIII in Spanish), Madrid, Spain
- Network Biomedical Research on Tropical Diseases (RICET in Spanish), Madrid, Spain
- * E-mail:
| | - Amalia Fernandez-Martinez
- National Centre for Tropical Medicine, Health Institute Carlos III (ISCIII in Spanish), Madrid, Spain
- Network Biomedical Research on Tropical Diseases (RICET in Spanish), Madrid, Spain
| | - Agustín Benito
- National Centre for Tropical Medicine, Health Institute Carlos III (ISCIII in Spanish), Madrid, Spain
- Network Biomedical Research on Tropical Diseases (RICET in Spanish), Madrid, Spain
| | - Rogelio Lopez-Velez
- Network Biomedical Research on Tropical Diseases (RICET in Spanish), Madrid, Spain
- National Referral Unit for Tropical Diseases, Infectious Diseases Department, Ramón y Cajal Hospital, Instituto Ramón y Cajal de Investigación Sanitaria, Madrid, Spain
| |
Collapse
|
24
|
Donadeu M, Fahrion AS, Olliaro PL, Abela-Ridder B. Target product profiles for the diagnosis of Taenia solium taeniasis, neurocysticercosis and porcine cysticercosis. PLoS Negl Trop Dis 2017; 11:e0005875. [PMID: 28892472 PMCID: PMC5608417 DOI: 10.1371/journal.pntd.0005875] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 09/21/2017] [Accepted: 08/17/2017] [Indexed: 11/19/2022] Open
Abstract
Target Product Profiles (TPPs) are process tools providing product requirements to guide researchers, developers and manufacturers in their efforts to develop effective and useful products such as biologicals, drugs or diagnostics. During a WHO Stakeholders Meeting on Taenia solium diagnostics, several TPPs were initiated to address diagnostic needs for different stages in the parasite's transmission (taeniasis, human and porcine cysticercosis). Following the meeting, draft TPPs were completed and distributed for consultation to 100 people/organizations, including experts in parasitology, human and pig cysticercosis, diagnostic researchers and manufacturers, international organizations working with neglected or zoonotic diseases, Ministries of Health and Ministries of Livestock in some of the endemic countries, WHO regional offices and other interested parties. There were 53 respondents. All comments and feedback received were considered and discussions were held with different experts according to their area of expertise. The comments were consolidated and final TPPs are presented here. They are considered to be live documents which are likely to undergo review and updating in the future when new knowledge and technologies become available.
Collapse
Affiliation(s)
- Meritxell Donadeu
- The University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Veterinary Clinical Centre, Werribee, Victoria, Australia
- Initiative for Neglected Animal Diseases (INAND), Midrand, South Africa
- * E-mail:
| | - Anna S. Fahrion
- Department of Control of Neglected Tropical Diseases, World Health Organization, Genève, Switzerland
| | - Piero L. Olliaro
- Special Programme for Research and Training in Tropical Diseases (TDR), World Health Organization, Genève, Switzerland
| | - Bernadette Abela-Ridder
- Department of Control of Neglected Tropical Diseases, World Health Organization, Genève, Switzerland
| |
Collapse
|
25
|
Ng-Nguyen D, Stevenson MA, Dorny P, Gabriël S, Vo TV, Nguyen VAT, Phan TV, Hii SF, Traub RJ. Comparison of a new multiplex real-time PCR with the Kato Katz thick smear and copro-antigen ELISA for the detection and differentiation of Taenia spp. in human stools. PLoS Negl Trop Dis 2017; 11:e0005743. [PMID: 28686662 PMCID: PMC5517074 DOI: 10.1371/journal.pntd.0005743] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 07/19/2017] [Accepted: 06/23/2017] [Indexed: 11/19/2022] Open
Abstract
Background Taenia solium, the cause of neurocysticercosis (NCC), has significant socioeconomic impacts on communities in developing countries. This disease, along with taeniasis is estimated to infect 2.5 to 5 million people globally. Control of T. solium NCC necessitates accurate diagnosis and treatment of T. solium taeniasis carriers. In areas where all three species of Taenia tapeworms (T. solium, Taenia saginata and Taenia asiatica) occur sympatrically, conventional microscope- and copro-antigen based diagnostic methods are unable to distinguish between these three Taenia species. Molecular diagnostic tools have been developed to overcome this limitation; however, conventional PCR-based techniques remain unsuitable for large-scale deployment in community-based surveys. Moreover, a real-time PCR (qPCR) for the discrimination of all three species of Taenia in human stool does not exist. This study describes the development and validation of a new triplex Taq-Man probe-based qPCR for the detection and discrimination of all three Taenia human tapeworms in human stools collected from communities in the Central Highlands of Vietnam. The diagnostic characteristics of the test are compared with conventional Kato Katz (KK) thick smear and copro-antigen ELISA (cAgELISA) method utilizing fecal samples from a community based cross-sectional study. Using this new multiplex real-time PCR we provide an estimate of the true prevalence of taeniasis in the source population for the community based cross-sectional study. Methodology/Principal findings Primers and TaqMan probes for the specific amplification of T. solium, T. saginata and T. asiatica were designed and successfully optimized to target the internal transcribed spacer I (ITS-1) gene of T. solium and the cytochrome oxidase subunit I (COX-1) gene of T. saginata and T. asiatica. The newly designed triplex qPCR (T3qPCR) was compared to KK and cAgELISA for the detection of Taenia eggs in stool samples collected from 342 individuals in Dak Lak province, Central Highlands of Vietnam. The overall apparent prevalence of taeniasis in Dak Lak province was 6.72% (95% confidence interval (CI) [3.94–9.50]) in which T. solium accounted for 1.17% (95% CI [0.37–3.17]), according to the T3qPCR. There was sympatric presence of T. solium, T. saginata and T. asiatica. The T3qPCR proved superior to KK and cAgELISA for the detection and differentiation of Taenia species in human feces. Diagnostic sensitivities of 0.94 (95% credible interval (CrI) [0.88–0.98]), 0.82 (95% CrI [0.58–0.95]) and 0.52 (95% CrI [0.07–0.94]), and diagnostic specificities of 0.98 (95% CrI [0.94–1.00]), 0.91 (95% CrI [0.85–0.96]) and 0.99 (95% CrI [0.96–1.00]) were estimated for the diagnosis of taeniasis for the T3qPCR, cAgELISA and KK thick smear in this study, respectively. Conclusions T3qPCR is not only superior to the KK thick smear and cAgELISA in terms of diagnostic sensitivity and specificity, but it also has the advantage of discriminating between species of Taenia eggs in stools. Application of this newly developed T3qPCR has identified the existence of all three human Taenia tapeworms in Dak Lak province and proves for the first time, the existence of T. asiatica in the Central Highlands and the south of Vietnam. Human taeniid tapeworms comprise three species, Taenia solium, Taenia saginata and Taenia asiatica. Taeniasis is a meat-borne zoonosis transmitted by the consumption of cysticerci in raw or undercooked pork for T. solium and T. asiatica (liver) and in beef for T. saginata. Accidental ingestion of T. solium eggs by humans also results in the formation of cysticerci, often in the brain, referred to as neurocysticercosis (NCC). T. solium NCC is a significant cause of morbidity and mortality owing to epilepsy in many resource-poor communities. In animals, ingestion of eggs passed by humans results in organ and/or carcass condemnation and suboptimal economic outcomes for farmers. The accurate diagnosis of T. solium tapeworm carriers is essential to monitor the success of control programs. In areas where all three species of Taenia tapeworms occur together, conventional diagnostic methods are unable to distinguish between the different species of Taenia. In this study, we develop and apply a T3qPCR capable of detecting and discriminating all three-tapeworm species in stools in a rapid and high-throughput fashion, suitable for large-scale community surveys. The newly developed T3qPCR proved superior to previously developed immunodiagnostic and conventional microscopic-based tests in terms of diagnostic sensitivity, specificity and the ability to identify and distinguish human Taenia species. This qPCR assay facilitated the identification of T. asiatica tapeworms in the Central Highlands of Vietnam, for the first time.
Collapse
Affiliation(s)
- Dinh Ng-Nguyen
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
- Faculty of Animal Sciences and Veterinary Medicine, Tay Nguyen University, Dak Lak, Vietnam
- * E-mail: ,
| | - Mark A. Stevenson
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Pierre Dorny
- Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Sarah Gabriël
- Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
| | - Tinh Van Vo
- Department of Physiology, Pathology and Immunology, Pham Ngoc Thach University of Medicine, Ho Chi Minh, Vietnam
| | - Van-Anh Thi Nguyen
- Faculty of Animal Sciences and Veterinary Medicine, Tay Nguyen University, Dak Lak, Vietnam
| | - Trong Van Phan
- Faculty of Animal Sciences and Veterinary Medicine, Tay Nguyen University, Dak Lak, Vietnam
| | - Sze Fui Hii
- Barwon Health, University Hospital Geelong, Victoria, Australia
| | - Rebecca J. Traub
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| |
Collapse
|
26
|
Trevisan C, Montillo M, Prandi A, Mkupasi EM, Ngowi HA, Johansen MV. Hair cortisol and dehydroepiandrosterone concentrations in naturally Taenia solium infected pigs in Tanzania. Gen Comp Endocrinol 2017; 246:23-28. [PMID: 28322765 PMCID: PMC5396532 DOI: 10.1016/j.ygcen.2017.03.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Revised: 02/20/2017] [Accepted: 03/14/2017] [Indexed: 10/29/2022]
Abstract
The aim of this study was to measure hair cortisol and dehydroepiandrosterone (DHEA) concentrations in naturally Taenia solium infected and non-infected control pigs and assess the effect of an environmental change on the aforementioned parameters. Three hair patches were obtained from 13 T. solium infected and 15 non-infected controls sows, respectively corresponding to 3 time points (prior to, at and approximately two weeks after arrival at the research facility). Cortisol and DHEA were extracted using methanol and analysed by radio immune assay. Mean hair cortisol concentrations were significantly lower (p<0.001) in T. solium infected (4.7±3.0pg/mg) compared to control pigs (9.0±3.7pg/mg) prior to arrival at the research facility, however no significant difference was observed between the two groups at arrival and after approximately two weeks. Similar patterns were also observed for DHEA concentrations (infected pigs 253.9±82.3pg/mg, control pigs 387.7±116.4pg/mg) (p<0.001). Results showed that lean animals had significantly higher cortisol concentrations in both groups, infected and controls pigs, while DHEA was not significantly different between lean and normal animals. Results of this study have shown that an environmental change could have an effect on pigs' hormonal levels suggesting an undergoing adaptation process. After the pigs were kept under the same conditions, fed and watered ad libitum, no significant differences were observed between the groups, but a drop in DHEA concentrations was observed in all the pigs. Weight however had an effect on cortisol levels as lean animals had significantly higher cortisol concentrations in both groups, compared to normal pigs.
Collapse
Affiliation(s)
- Chiara Trevisan
- Department of Veterinary and Animal Sciences, University of Copenhagen, Dyrlægevej 100, 1870 Frederiksberg C, Denmark
| | - Marta Montillo
- Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Via Sondrio 2/A, 33100 Udine, Italy.
| | - Alberto Prandi
- Department of Agricultural, Food, Environmental and Animal Sciences, University of Udine, Via Sondrio 2/A, 33100 Udine, Italy
| | - Ernatus M Mkupasi
- Department of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro, Tanzania
| | - Helena A Ngowi
- Department of Veterinary Medicine and Public Health, Sokoine University of Agriculture, P.O. Box 3021, Morogoro, Tanzania
| | - Maria V Johansen
- Department of Veterinary and Animal Sciences, University of Copenhagen, Dyrlægevej 100, 1870 Frederiksberg C, Denmark
| |
Collapse
|
27
|
Pray IW, Ayvar V, Gamboa R, Muro C, Moyano LM, Benavides V, Flecker RH, Garcia HH, O’Neal SE. Spatial relationship between Taenia solium tapeworm carriers and necropsy cyst burden in pigs. PLoS Negl Trop Dis 2017; 11:e0005536. [PMID: 28406898 PMCID: PMC5404875 DOI: 10.1371/journal.pntd.0005536] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 04/25/2017] [Accepted: 03/29/2017] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Taenia solium, a parasite that affects humans and pigs, is the leading cause of preventable epilepsy in the developing world. Geographic hotspots of pigs testing positive for serologic markers of T. solium exposure have been observed surrounding the locations of human tapeworm carriers. This clustered pattern of seropositivity in endemic areas formed the basis for geographically targeted control interventions, which have been effective at reducing transmission. In this study, we further explore the spatial relationship between human tapeworm carriers and infected pigs using necroscopic examination as a quantitative gold-standard diagnostic to detect viable T. solium cyst infection in pigs. METHODOLOGY/PRINCIPAL FINDINGS We performed necroscopic examinations on pigs from 7 villages in northern Peru to determine the number of viable T. solium cysts in each pig. Participating humans in the study villages were tested for T. solium tapeworm infection (i.e., taeniasis) with an ELISA coproantigen assay, and the distances from each pig to its nearest human tapeworm carrier were calculated. We assessed the relationship between proximity to a tapeworm carrier and the prevalence of light, moderate, and heavy cyst burden in pigs. The prevalence of pig infection was greatest within 50 meters of a tapeworm carrier and decreased monotonically as distance increased. Pigs living less than 50 meters from a human tapeworm carrier were 4.6 times more likely to be infected with at least one cyst than more distant pigs. Heavier cyst burdens, however, were not more strongly associated with proximity to tapeworm carriers than light cyst burdens. CONCLUSION/SIGNIFICANCE Our study shows that human tapeworm carriers and pigs with viable T. solium cyst infection are geographically correlated in endemic areas. This finding supports control strategies that treat humans and pigs based on their proximity to other infected individuals. We did not, however, find sufficient evidence that heavier cyst burdens in pigs would serve as improved targets for geographically focused control interventions.
Collapse
Affiliation(s)
- Ian W. Pray
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
- * E-mail:
| | - Viterbo Ayvar
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Ricardo Gamboa
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Claudio Muro
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Luz M. Moyano
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Victor Benavides
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Robert H. Flecker
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
| | - Hector H. Garcia
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
- School of Sciences, Department of Microbiology, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Seth E. O’Neal
- School of Public Health, Oregon Health & Science University and Portland State University, Portland, Oregon, United States of America
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| |
Collapse
|
28
|
Gripper LB, Welburn SC. The causal relationship between neurocysticercosis infection and the development of epilepsy - a systematic review. Infect Dis Poverty 2017; 6:31. [PMID: 28376856 PMCID: PMC5381143 DOI: 10.1186/s40249-017-0245-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Accepted: 01/13/2017] [Indexed: 12/02/2022] Open
Abstract
BACKGROUND Neurocysticercosis (NCC) is a parasitic infection of the human central nervous system, the most common form of which involves infection of the brain parenchyma with the larval form of the Taenia solium tapeworm. A causal relationship between such an NCC infection and the development of epilepsy in infected individuals is acknowledged, in part supported by high levels of comorbidity in endemic countries worldwide. METHODS This study undertook a systematic review and critical analysis of the NCC-epilepsy relationship with the primary objective of quantifying the risk of developing epilepsy following NCC infection. A secondary aim was to analyse the proportions of NCC-associated epilepsy within different populations. Significant emphasis was placed on the importance of neuroimaging (CT or MRI) availability and use of clear guidelines for epilepsy diagnosis, in order to avoid overestimations of prevalence rates of either condition; a limitation identified in several previous studies. RESULTS A common odds ratio of 2.76 was identified from meta-analysis of case-control studies, indicating that an individual infected with NCC has almost a three times higher risk of developing epilepsy than an uninfected individual. Furthermore, meta-analysis of studies identified a common proportion of 31.54% of epilepsy cases associated with NCC infection which suggests that amongst epileptic populations in at risk countries, approximately one-third may be associated with NCC infection. CONCLUSION A significant finding was the lack of good clinical data to enable accurate determination of a causal relationship. Even studies that were included had noticeable limitations, including a general lack of consistency in diagnostics, and lack of accurate epidemiological data. This review highlights a need for consistency in research in this field. In the absence of reliable estimates of its global burden, NCC will remain of low priority in the eyes of funding agencies - a truly neglected disease.
Collapse
Affiliation(s)
- Lucy B. Gripper
- Division of Infection and Pathway Medicine, Edinburgh Infectious Diseases, Edinburgh Medical School: Biomedical Sciences, College of Medicine and Veterinary Medicine, The University of Edinburgh, Chancellor’s Building, 49 Little France Crescent, Edinburgh, EH16 4SB Scotland UK
| | - Susan C. Welburn
- Division of Infection and Pathway Medicine, Edinburgh Infectious Diseases, Edinburgh Medical School: Biomedical Sciences, College of Medicine and Veterinary Medicine, The University of Edinburgh, Chancellor’s Building, 49 Little France Crescent, Edinburgh, EH16 4SB Scotland UK
| |
Collapse
|
29
|
Thomas LF, de Glanville WA, Cook EAJ, Bronsvoort BMDC, Handel I, Wamae CN, Kariuki S, Fèvre EM. Modelling the risk of Taenia solium exposure from pork produced in western Kenya. PLoS Negl Trop Dis 2017; 11:e0005371. [PMID: 28212398 PMCID: PMC5333911 DOI: 10.1371/journal.pntd.0005371] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 03/02/2017] [Accepted: 01/29/2017] [Indexed: 11/30/2022] Open
Abstract
The tapeworm Taenia solium is the parasite responsible for neurocysticercosis, a neglected tropical disease of public health importance, thought to cause approximately 1/3 of epilepsy cases across endemic regions. The consumption of undercooked infected pork perpetuates the parasite’s life-cycle through the establishment of adult tapeworm infections in the community. Reducing the risk associated with pork consumption in the developing world is therefore a public health priority. The aim of this study was to estimate the risk of any one pork meal in western Kenya containing a potentially infective T. solium cysticercus at the point of consumption, an aspect of the parasite transmission that has not been estimated before. To estimate this, we used a quantitative food chain risk assessment model built in the @RISK add-on to Microsoft Excel. This model indicates that any one pork meal consumed in western Kenya has a 0.006 (99% Uncertainty Interval (U.I). 0.0002–0.0164) probability of containing at least one viable T. solium cysticercus at the point of consumption and therefore being potentially infectious to humans. This equates to 22,282 (99% U.I. 622–64,134) potentially infective pork meals consumed in the course of one year within Busia District alone. This model indicates a high risk of T. solium infection associated with pork consumption in western Kenya and the work presented here can be built upon to investigate the efficacy of various mitigation strategies for this locality. Taenia solium is a serious zoonotic helminth which is thought to be responsible for approximately 1/3rd of epilepsy cases in the developing world. The work presented in this paper aimed to understand what the risk is of acquiring T. solium taeniosis from pork slaughtered and consumed in western Kenya. In order to do this we built a stochastic risk assessment model to investigate the safety of pork reaching the consumer in terms of the risk of having viable T. solium cysts in any one portion of meat consumed. We found that pork represents a high risk product in this study area and therefore control strategies are urgently needed to reduce the public health risk posed by this product.
Collapse
Affiliation(s)
- Lian F. Thomas
- University of Edinburgh, Centre for Infection, Immunology and Evolution, School of Biological Sciences, Ashworth Laboratories, West Mains Rd, Edinburgh, Scotland
- International Livestock Research Institute, Nairobi, Kenya
- * E-mail:
| | - William A. de Glanville
- University of Edinburgh, Centre for Infection, Immunology and Evolution, School of Biological Sciences, Ashworth Laboratories, West Mains Rd, Edinburgh, Scotland
- International Livestock Research Institute, Nairobi, Kenya
| | - Elizabeth A. J. Cook
- University of Edinburgh, Centre for Infection, Immunology and Evolution, School of Biological Sciences, Ashworth Laboratories, West Mains Rd, Edinburgh, Scotland
- International Livestock Research Institute, Nairobi, Kenya
| | - Barend M. De C. Bronsvoort
- The Roslin Institute and The Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, Midlothian, United Kingdom
| | - Ian Handel
- The Roslin Institute and The Royal (Dick) School of Veterinary Studies, University of Edinburgh, Roslin, Midlothian, United Kingdom
| | - Claire N. Wamae
- Centre for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
- Department of Microbiology, School of Medicine, Mount Kenya University, Thika, Kenya
| | - Samuel Kariuki
- Centre for Microbiology Research, Kenya Medical Research Institute, Nairobi, Kenya
| | - Eric M. Fèvre
- International Livestock Research Institute, Nairobi, Kenya
- Institute of Infection and Global Health, University of Liverpool, Leahurst Campus, Neston, United Kingdom
| |
Collapse
|
30
|
Kungu JM, Dione MM, Ejobi F, Ocaido M, Grace D. Risk factors, perceptions and practices associated with Taenia solium cysticercosis and its control in the smallholder pig production systems in Uganda: a cross-sectional survey. BMC Infect Dis 2017; 17:1. [PMID: 28049444 PMCID: PMC5209818 DOI: 10.1186/s12879-016-2122-x] [Citation(s) in RCA: 105] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Accepted: 12/14/2016] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Prevalence studies report Taenia solium cysticercosis in pig and human populations in Uganda. However, the factors influencing occurrence in smallholder pig production systems are not well documented and little is known about farmers' perceptions of T. solium cysticercosis or farmer practices that could reduce transmission. METHODS To determine the risk factors, perceptions and practices regarding T. solium cysticercosis, a household survey using a semi-structured questionnaire was conducted in 1185 households in the rural and urban pig production systems in Masaka, Mukono and Kamuli Districts. Logistic regression was used to measure associations of risk factors with infection. Performance scores were calculated to summarise perceptions and practices of farmers regarding taeniosis, human cysticercosis and porcine cysticercosis as well as farmer behavior related to control or breaking transmission. RESULTS Pig breed type, farmers' knowledge about transmission, sources of water used, and pig keeping homes where family members were unable to use the latrine were all significantly associated with T. solium cysticercosis in pigs. Performance scores indicated that farmers were more aware of taeniosis (63.0%; 95% Confidence Interval 60.0-65.8) than human or porcine cysticercosis; only three farmers (0.3%, 95% CI = 0.1-0.8) had knowledge on all three conditions. More farmers reported that they dewormed pigs (94.1%) than reported deworming themselves and their family members (62.0%). Albendazole was the most commonly used drug for deworming both pigs and humans (85.0 and 81.5% respectively). Just over half (54.6%) of the farmers interviewed had clean water near the latrines for washing hands. Of these, only 41.9% used water with soap to wash hands after latrine use. CONCLUSION Factors that significantly influenced occurrence of T. solium cysticercosis in pigs were identified. Farmers had some knowledge about the disease but did not link taeniosis, human cysticercosis, and porcine cysticercosis. Therefore, there is need to employ strategies that raise awareness and interrupt transmission.
Collapse
Affiliation(s)
- Joseph M. Kungu
- National Livestock Resources Research Institute, P. O. Box 96, Tororo, Uganda
- College of Veterinary Medicine Animal Resources and Biosecurity, Makerere University, P. O. Box 7062, Kampala, Uganda
- International Livestock Research Institute, P.O. Box 24384, Kampala, Uganda
| | - Michel M. Dione
- International Livestock Research Institute, P.O. Box 24384, Kampala, Uganda
| | - Francis Ejobi
- College of Veterinary Medicine Animal Resources and Biosecurity, Makerere University, P. O. Box 7062, Kampala, Uganda
| | - Michael Ocaido
- College of Veterinary Medicine Animal Resources and Biosecurity, Makerere University, P. O. Box 7062, Kampala, Uganda
| | - Delia Grace
- International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya
| |
Collapse
|
31
|
Nkouawa A, Dschanou AR, Moyou-Somo R, Sako Y, Ito A. Seroprevalence and risk factors of human cysticercosis and taeniasis prevalence in a highly endemic area of epilepsy in Bangoua, west Cameroon. Acta Trop 2017; 165:116-120. [PMID: 26747010 DOI: 10.1016/j.actatropica.2015.12.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 12/24/2015] [Accepted: 12/26/2015] [Indexed: 11/17/2022]
Abstract
Cysticercosis caused by the larvae of Taenia solium is a serious and emerging threat to public health in the endemic areas as well as in the non-endemic areas. Neurocysticercosis, an affection of the central nervous system is a leading cause of epilepsy in endemic areas. This study was carried out to investigate human cysticercosis, taeniasis and risk factors, and also their association with epilepsy in Bangoua, west Cameroon where epilepsy is highly prevalent. Out of 384 people investigated, 12 (3.1%) exhibited antibody response against low molecular weight antigens of T. solium by ELISA. Immunoblot revealed that six persons (1.6%) were seropositive with the same antigens. Among 61 epileptic patients, only one was seropositive by immunoblot and the study did not find any statistically significant difference (P>0.05) in seropositivity to T. solium between epileptic persons (1/61, 1.6%) and non-epileptic group (5/323, 1.5%). In addition, cysticercosis was associated with households eating pork meat from pigs slaughtered at home, but not with other factors. The risk factors including pig farming, the consumption of pork meat, vegetables, and non-drinkable water were attenuated by the relatively good hygiene and pig husbandry practices of the population. No egg of Taenia was found in stool by microscopic examination. All data obtained in this study suggested that cysticercosis might not be the principal causative agent of epilepsy in this area.
Collapse
Affiliation(s)
- Agathe Nkouawa
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan; Medical Research Centre, Institute of Medical Research and Medicinal Plants Studies (IMPM), Ministry of Scientific Research and Innovation, Yaoundé, Cameroon.
| | | | - Roger Moyou-Somo
- Medical Research Centre, Institute of Medical Research and Medicinal Plants Studies (IMPM), Ministry of Scientific Research and Innovation, Yaoundé, Cameroon; Department of Parasitology and Infectious Diseases, Faculty of Medicine and Biomedical Sciences, University of Yaoundé I, Yaoundé, Cameroon
| | - Yasuhito Sako
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan
| | - Akira Ito
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan
| |
Collapse
|
32
|
Kungu JM, Dione MM, Ejobi F, Harrison LJS, Poole EJ, Pezo D, Grace D. Sero-prevalence of Taenia spp. cysticercosis in rural and urban smallholder pig production settings in Uganda. Acta Trop 2017; 165:110-115. [PMID: 26801882 DOI: 10.1016/j.actatropica.2016.01.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 01/12/2016] [Accepted: 01/15/2016] [Indexed: 11/30/2022]
Abstract
The pork tapeworm, Taenia solium, is prevalent in Uganda although the prevalence has not been determined in all areas of the country. A cross-sectional study, to determine the sero-prevalence of the parasite in pigs kept under rural and urban production settings, was carried out in three Ugandan districts, Masaka, Mukono and Kamuli. Serum samples from 1185 pigs were tested for the presence of T. solium cysticercosis antigen using the HP10 antigen-ELISA (Ag-ELISA) and the ApDia Ag-ELISA assays. Using parallel interpretation of the two tests showed lower levels of observed prevalence of T. solium in rural production settings (10.8%) compared to urban (17.1%). Additionally, Maximum Likelihood Estimation for evaluating assays in the absence of a gold standard, using TAGS on the R platform, estimated the true sero-prevalence to be lower in rural production setting, 0.0% [0.0-3.2%; 95% confidence interval (CI)] than in urban production setting, 12.3% (4.2-77.5% CI). When the sensitivity/specificity (Se/Sp) of the assays were estimated, assuming conditional independence of the tests, HP10 Ag-ELISA was more sensitive and specific [(Se=53.9%; 10.1-100% CI), (Sp=97.0%; 95.9-100% CI)] than the ApDia assay [(Se=20.2%; 1.5-47.7% CI), (Sp=92.2%; 90.5-93.9% CI)]. Subject to parasitological verification, these results indicate there may be a need to implement appropriate control measures for T. solium in the study areas.
Collapse
Affiliation(s)
- Joseph M Kungu
- National Livestock Research Resources Institute, P. O. Box 96, Tororo, Uganda; College of Veterinary Medicine and Biosecurity, Makerere University, P. O. Box 7062, Kampala, Uganda; International Livestock Research Institute, P.O. Box 24384, Kampala, Uganda.
| | - Michel M Dione
- International Livestock Research Institute, P.O. Box 24384, Kampala, Uganda.
| | - Francis Ejobi
- College of Veterinary Medicine and Biosecurity, Makerere University, P. O. Box 7062, Kampala, Uganda.
| | - Leslie J S Harrison
- University of Edinburgh, Royal (Dick) School of Veterinary Science, Easter Bush Veterinary Centre, Easter Bush, Roslin, Midlothian, Scotland EH259RG, UK.
| | - E Jane Poole
- International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya.
| | - Danilo Pezo
- International Livestock Research Institute, P.O. Box 24384, Kampala, Uganda.
| | - Delia Grace
- International Livestock Research Institute, P.O. Box 30709, Nairobi, Kenya.
| |
Collapse
|
33
|
Martins-Melo FR, Ramos AN, Cavalcanti MG, Alencar CH, Heukelbach J. Reprint of "Neurocysticercosis-related mortality in Brazil, 2000-2011: Epidemiology of a neglected neurologic cause of death". Acta Trop 2017; 165:170-178. [PMID: 27887696 DOI: 10.1016/j.actatropica.2016.11.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Revised: 09/23/2015] [Accepted: 10/16/2015] [Indexed: 11/30/2022]
Abstract
Neurocysticercosis (NCC) is an important cause of severe neurological disease mainly in low- and middle-income countries, but data on NCC mortality from endemic areas are scarce. Here we analysed the epidemiological patterns of NCC-related mortality in Brazil. We included all deaths recorded in Brazil between 2000 and 2011, in which NCC was mentioned on death certificates, either as underlying or as associated cause of death. NCC was identified in 1829/12,491,280 deaths (0.015%), 1130 (61.8%) as underlying cause, and 699 (38.2%) as associated cause. Overall age-adjusted mortality rate for the period was 0.97 deaths/1,000,000 inhabitants (95% confidence interval [CI]: 0.83-1.12). The highest NCC-related mortality rates were found in males, elderly, white race/colour and residents in endemic states/regions. Age-adjusted mortality rates at national level decreased significantly over time (annual percent change [APC]: -4.7; 95% CI: -6.0 to -3.3), with a decrease in the Southeast, South and Central-West regions, and a non-significant increasing trend in the North and Northeast regions. We identified spatial and spatiotemporal high-risk mortality clusters located mainly in NCC-endemic areas. Conditions related to the nervous system were the most commonly associated causes of death when NCC was mentioned as an underlying cause, and HIV/AIDS was the main underlying cause when NCC was an associated cause. NCC is a neglected and preventable cause of severe neurologic disease and death with high public health impact in Brazil. There is a clear need to strengthen nationwide epidemiological surveillance and control for the taeniasis/cysticercosis complex.
Collapse
Affiliation(s)
- Francisco Rogerlândio Martins-Melo
- Department of Community Health, School of Medicine, Federal University of Ceará, Rua Professor Costa Mendes, 1608, Rodolfo Teófilo, 60430-140 Fortaleza, CE, Brazil; Federal Institute of Education, Science and Technology of Ceará, Rua Engenheiro João Alfredo, s/n, Pabussu, 61600-000 Caucaia, CE, Brazil.
| | - Alberto Novaes Ramos
- Department of Community Health, School of Medicine, Federal University of Ceará, Rua Professor Costa Mendes, 1608, Rodolfo Teófilo, 60430-140 Fortaleza, CE, Brazil
| | - Marta Guimarães Cavalcanti
- Infectious and Parasitic Diseases Service, Clementino Fraga Filho University Hospital, Federal University of Rio de Janeiro, Rua Rodolpho Paulo Rocco, 255, Cidade Universitária, 21941-913 Rio de Janeiro, RJ, Brazil
| | - Carlos Henrique Alencar
- Department of Community Health, School of Medicine, Federal University of Ceará, Rua Professor Costa Mendes, 1608, Rodolfo Teófilo, 60430-140 Fortaleza, CE, Brazil
| | - Jorg Heukelbach
- Department of Community Health, School of Medicine, Federal University of Ceará, Rua Professor Costa Mendes, 1608, Rodolfo Teófilo, 60430-140 Fortaleza, CE, Brazil; Anton Breinl Centre for Public Health and College of Public Health, Medical and Veterinary Sciences, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD 4811, Australia.
| |
Collapse
|
34
|
Wu HW, Ito A, Ai L, Zhou XN, Acosta LP, Lee Willingham A. Cysticercosis/taeniasis endemicity in Southeast Asia: Current status and control measures. Acta Trop 2017; 165:121-132. [PMID: 26802488 DOI: 10.1016/j.actatropica.2016.01.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/02/2015] [Accepted: 01/10/2016] [Indexed: 12/26/2022]
Abstract
The parasitic zoonoses cysticercosis/taeniasis is among the 17 major Neglected Tropical Diseases (NTDs) identified by the WHO as a focus for research and control. It is caused by a larval stage (cysticercus) infection of Taenia solium tapeworm in both humans and pigs. Cysticercosis occurs in many resource-poor countries, especially those with warm and mild climates in the regions of Latin America (LA), Asia and Sub-Saharan Africa (SSA). The prevalence of human cysticercosis is marked in those areas where individuals are traditionally keen to consume raw or insufficiently cooked pork and/or where the husbandry of pigs is improper. The worldwide burden of cysticercosis is unclear and notably, large-scale control initiatives are lacking in all regions. This review focuses on the current endemic status of cysticercosis caused by T. solium infection in both humans and pigs living in 13 Southeast Asian countries. We will also emphasize epidemiological data as well as prevention and control of human neurocysticercosis.
Collapse
Affiliation(s)
- Hai-Wei Wu
- Center for International Health Research, Rhode Island Hospital, Brown University Medical School, Providence, RI, USA; Department of Pediatrics, Rhode Island Hospital, Brown University Medical School, Providence, RI, USA.
| | - Akira Ito
- Department of Parasitology and Neglected Tropical Diseases Research Laboratory, Asahikawa Medical University, Asahikawa, Japan
| | - Lin Ai
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, People's Republic of China
| | - Xiao-Nong Zhou
- National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai, People's Republic of China
| | - Luz P Acosta
- Department of Immunology, Research Institute for Tropical Medicine, Alabang, Muntinlupa, Philippines
| | - Arve Lee Willingham
- One Health Center for Zoonoses and Tropical Veterinary Medicine, Ross University School of Veterinary Medicine, Basseterre, St. Kitts, West Indies
| |
Collapse
|
35
|
Devleesschauwer B, Allepuz A, Dermauw V, Johansen MV, Laranjo-González M, Smit GSA, Sotiraki S, Trevisan C, Wardrop NA, Dorny P, Gabriël S. Taenia solium in Europe: Still endemic? Acta Trop 2017; 165:96-99. [PMID: 26276698 DOI: 10.1016/j.actatropica.2015.08.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 07/20/2015] [Accepted: 08/08/2015] [Indexed: 11/17/2022]
Abstract
The pork tapeworm, Taenia solium, causes an important economic and health burden, mainly in rural or marginalized communities of sub-Saharan Africa, Asia, and Latin-America. Although improved pig rearing conditions seem to have eliminated the parasite in most Western European countries, little is known about the true endemicity status of T. solium throughout Europe. Three recent reviews indicate that autochthonous human T. solium taeniasis/cysticercosis may be possible in Europe, but that current peer-reviewed literature is biased towards Western Europe. Officially reported data on porcine cysticercosis are highly insufficient. Favourable conditions for local T. solium transmission still exist in eastern parts of Europe, although the ongoing integration of the European Union is speeding up modernisation and intensification of the pig sector. Further evidence is urgently needed to fill the gaps on the European T. solium endemicity map. We urge to make human cysticercosis notifiable and to improve the reporting of porcine cysticercosis.
Collapse
Affiliation(s)
- Brecht Devleesschauwer
- Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
| | - Alberto Allepuz
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain; Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Veronique Dermauw
- Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Maria V Johansen
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Minerva Laranjo-González
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - G Suzanne A Smit
- Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium; Institute of Health and Society (IRSS), Université catholique de Louvain, Brussels, Belgium
| | - Smaragda Sotiraki
- Veterinary Research Institute, Hellenic Agricultural Organisation-Demeter, Thessaloniki, Greece
| | - Chiara Trevisan
- Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Nicola A Wardrop
- Geography and Environment, University of Southampton, Southampton, UK
| | - Pierre Dorny
- Department of Virology, Parasitology and Immunology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium; Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Sarah Gabriël
- Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| |
Collapse
|
36
|
Zhnakina ZV, Kuznetsova KY, Maniya MR, Sergiev VP. [(CHANGE IN THE DIAGNOSTIC CHARACTERISTICS OF ANTIBODIES TO CYSTICERCUS CELL ULOSAE IN THE SERUM SAMPLE COLLECTION IN RELATION TO THE PERIOD OF STORAGE DURING DEEP FREEZING)]. Med Parazitol (Mosk) 2017; 1:25-26. [PMID: 30721611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The paper gives the results of experimental studies determining the preservation of antibodies to C.cellulosae in the serum in relation to the period of their storage during deep freezing. These studies, as applied to parasitic pathology, have been conducted for the first time and are of practical medical value in determining optimal procedures and periods of serum storage without a loss of their diagnostic characteristics.
Collapse
|
37
|
Affiliation(s)
- Qiang Meng
- First People's Hospital of Yunnan Province, Kunming, China
| | - Lingchun Liu
- First People's Hospital of Yunnan Province, Kunming, China
| |
Collapse
|
38
|
Johnston JM, Dyer CD, Madison-Antenucci S, Mergen KA, Veeder CL, Brice AK. Neurocysticercosis in a Rhesus Macaque ( Macaca mulatta). Comp Med 2016; 66:499-502. [PMID: 28304255 PMCID: PMC5157967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 05/26/2016] [Accepted: 06/12/2016] [Indexed: 06/06/2023]
Abstract
An 8-y-old, intact, male rhesus macaque (Macaca mulatta) was sedated to undergo MRI in preparation for the implantation of cranial hardware. During imaging, 9 focal lesions were noted in the brain and musculature of the head. The lesions were hyperechoic with hypoechoic rims. The animal was deemed inappropriate for neuroscience research, and euthanasia was elected. Gross examination revealed multiple round, thick-walled, fluid-filled cysts (diameter, approximately 0.5 cm) in multiple tissues: one each in the left caudal lung lobe, left masseter muscle, and the dura overlying the brain and 8 throughout the gray and white matter of the brain parenchyma. Formalin-fixed sections of cyst-containing brain were stained with hematoxylin and eosin. Microscopic examination and molecular analysis of the COX1 (COI) gene recognized the causative organism as Taenia solium at 99.04% identity.
Collapse
Affiliation(s)
- Jessica M Johnston
- Department of Pathobiology and University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania, New York
| | - Cecilia D Dyer
- Department of Pathobiology and University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania, New York
| | | | | | - Christin L Veeder
- Department of Pathobiology and University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania, New York
| | - Angela K Brice
- Department of Pathobiology and University Laboratory Animal Resources, University of Pennsylvania, Philadelphia, Pennsylvania, New York;,
| |
Collapse
|
39
|
Swastika K, Dharmawan NS, Suardita IK, Kepeng IN, Wandra T, Sako Y, Okamoto M, Yanagida T, Sasaki M, Giraudoux P, Nakao M, Yoshida T, Eka Diarthini LP, Sudarmaja IM, Purba IE, Budke CM, Ito A. Swine cysticercosis in the Karangasem district of Bali, Indonesia: An evaluation of serological screening methods. Acta Trop 2016; 163:46-53. [PMID: 27480240 DOI: 10.1016/j.actatropica.2016.07.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 07/05/2016] [Accepted: 07/28/2016] [Indexed: 01/07/2023]
Abstract
A serological assessment was undertaken on pigs from the Kubu and Abang sub-districts of Karangasem on the island of Bali, Indonesia, where earlier studies had detected patients with cysticercosis. Antigens purified from Taenia solium cyst fluid by cation-exchange chromatography were used to evaluate antibody responses in the pigs and the serological tests were also evaluated using sera from pigs experimentally infected with T. solium eggs. A total of 392 serum samples from naturally exposed pigs were tested using an ELISA that could be read based on both a colour change perceptible by the naked eye and an ELISA based on absorbance values. Twenty six (6.6%) pigs were found seropositive by the naked-eye ELISA and were categorized into three groups: strongly positive (absorbance values >0.8, n=6), moderately positive (absorbance values between 0.2 and 0.8, n=7), and weakly positive (absorbance values <0.2, n=13). Necropsies performed on 11 strongly and moderately positive pigs revealed that six strongly positive pigs were infected either solely with T. solium cysticerci (n=3), or co-infected with both T. solium and Taenia hydatigena (n=3). Four moderately positive pigs were infected solely with T. hydatigena. No cysticerci were found in one pig that was moderately positive by the naked-eye ELISA. Two experimentally infected pigs became antibody positive by 6 weeks post-infection, whereas eight control pigs remained negative. An additional 60 pigs slaughtered at authorized abattoirs on Bali were tested using the same ELISA. All 60 pigs were seronegative with no evidence of Taenia infection at necropsy. The results confirm the presence of porcine cysticercosis on Bali and, while the serological responses seen in T. solium infected animals were much stronger than those infected with T. hydatigena, the diagnostic antigens are clearly not species specific. Further studies are necessary to confirm if it is possible to draw a cut off line for differentiation of pig infected with T. solium from those infected with T. hydatigena.
Collapse
Affiliation(s)
- Kadek Swastika
- Department of Parasitology, Faculty of Medicine' Udayana University, Denpasar, Bali, Indonesia; Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan; Center for Human Evolution Modeling Research, Primate Research Institute, Kyoto University, Inuyama, Japan
| | - Nyoman Sadra Dharmawan
- Department of Parasitology, Faculty of Veterinary Medicine' Udayana University, Denpasar, Bali, Indonesia
| | - I Ketut Suardita
- Karangasem District Livestock, Fisheries and Marine Office Services, Bali, Indonesia
| | - I Nengah Kepeng
- Karangasem District Livestock, Fisheries and Marine Office Services, Bali, Indonesia
| | - Toni Wandra
- Directorate of Postgraduate, Sari Mutiara Indonesia University, Medan, North Sumatra, Indonesia
| | - Yasuhito Sako
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan
| | - Munehiro Okamoto
- Center for Human Evolution Modeling Research, Primate Research Institute, Kyoto University, Inuyama, Japan
| | - Tetsuya Yanagida
- Laboratory of Parasitology, Joint Faculty of Veterinary Medicine, Yamaguchi University, Yoshida, Japan
| | - Mizuki Sasaki
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan
| | - Patrick Giraudoux
- Chrono-environment Lab, UMR6249, University of Franche-Comté/CNRS and Institut Universitaire de France, Besançon, France
| | - Minoru Nakao
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan
| | - Takahiko Yoshida
- Department of Health Science, Asahikawa Medical University, Asahikawa, Japan
| | - Luh Putu Eka Diarthini
- Department of Parasitology, Faculty of Medicine' Udayana University, Denpasar, Bali, Indonesia
| | - I Made Sudarmaja
- Department of Parasitology, Faculty of Medicine' Udayana University, Denpasar, Bali, Indonesia
| | - Ivan Elisabeth Purba
- Directorate of Postgraduate, Sari Mutiara Indonesia University, Medan, North Sumatra, Indonesia
| | - Christine M Budke
- Department of Veterinary Integrative Biosciences, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA
| | - Akira Ito
- Department of Parasitology, Asahikawa Medical University, Asahikawa, Japan.
| |
Collapse
|
40
|
Garcia HH, Gonzalez AE, Tsang VCW, O'Neal SE, Llanos-Zavalaga F, Gonzalvez G, Romero J, Rodriguez S, Moyano LM, Ayvar V, Diaz A, Hightower A, Craig PS, Lightowlers MW, Gauci CG, Leontsini E, Gilman RH. Elimination of Taenia solium Transmission in Northern Peru. N Engl J Med 2016; 374:2335-44. [PMID: 27305193 PMCID: PMC4962610 DOI: 10.1056/nejmoa1515520] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
BACKGROUND Taeniasis and cysticercosis are major causes of seizures and epilepsy. Infection by the causative parasite Taenia solium requires transmission between humans and pigs. The disease is considered to be eradicable, but data on attempts at regional elimination are lacking. We conducted a three-phase control program in Tumbes, Peru, to determine whether regional elimination would be feasible. METHODS We systematically tested and compared elimination strategies to show the feasibility of interrupting the transmission of T. solium infection in a region of highly endemic disease in Peru. In phase 1, we assessed the effectiveness and feasibility of six intervention strategies that involved screening of humans and pigs, antiparasitic treatment, prevention education, and pig replacement in 42 villages. In phase 2, we compared mass treatment with mass screening (each either with or without vaccination of pigs) in 17 villages. In phase 3, we implemented the final strategy of mass treatment of humans along with the mass treatment and vaccination of pigs in the entire rural region of Tumbes (107 villages comprising 81,170 people and 55,638 pigs). The effect of the intervention was measured after phases 2 and 3 with the use of detailed necropsy to detect pigs with live, nondegenerated cysts capable of causing new infection. The necropsy sampling was weighted in that we preferentially included more samples from seropositive pigs than from seronegative pigs. RESULTS Only two of the strategies implemented in phase 1 resulted in limited control over the transmission of T. solium infection, which highlighted the need to intensify the subsequent strategies. After the strategies in phase 2 were implemented, no cyst that was capable of further transmission of T. solium infection was found among 658 sampled pigs. One year later, without further intervention, 7 of 310 sampled pigs had live, nondegenerated cysts, but no infected pig was found in 11 of 17 villages, including all the villages in which mass antiparasitic treatment plus vaccination was implemented. After the final strategy was implemented in phase 3, a total of 3 of 342 pigs had live, nondegenerated cysts, but no infected pig was found in 105 of 107 villages. CONCLUSIONS We showed that the transmission of T. solium infection was interrupted on a regional scale in a highly endemic region in Peru. (Funded by the Bill and Melinda Gates Foundation and others.).
Collapse
Affiliation(s)
- Hector H Garcia
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Armando E Gonzalez
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Victor C W Tsang
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Seth E O'Neal
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Fernando Llanos-Zavalaga
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Guillermo Gonzalvez
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Jaime Romero
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Silvia Rodriguez
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Luz M Moyano
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Viterbo Ayvar
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Andre Diaz
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Allen Hightower
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Philip S Craig
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Marshall W Lightowlers
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Charles G Gauci
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Elli Leontsini
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| | - Robert H Gilman
- From the Center for Global Health-Tumbes, Universidad Peruana Cayetano Heredia (H.H.G., S.E.O., L.M.M., V.A., A.D.), the Department of Microbiology (H.H.G.) and School of Public Health (F.L.-Z.), Universidad Peruana Cayetano Heredia, Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas (H.H.G., S.R.), Universidad Nacional Mayor de San Marcos, School of Veterinary Medicine (A.E.G.), and Inter-American Institute for Cooperation on Agriculture (J.R.) - all in Lima, Peru; Immunology Branch, Division of Parasitic Diseases and Malaria, National Center for Infectious Diseases (V.C.W.T.), and Data Management Activity, Division of Parasitic Diseases and Malaria, Center for Global Health (A.H.), Centers for Disease Control and Prevention, and Georgia State University (V.C.W.T.) - both in Atlanta; School of Public Health, Oregon Health and Science University and Portland State University, Portland (S.E.O.); Pan American Health Organization, Managua, Nicaragua (G.G.); University of Salford, School of Environment and Life Sciences, Greater Manchester, United Kingdom (P.S.C.); University of Melbourne, Faculty of Veterinary and Agricultural Sciences, Werribee, VIC, Australia (M.W.L., C.G.G.); and the Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore (E.L., R.H.G.)
| |
Collapse
|
41
|
Pray IW, Swanson DJ, Ayvar V, Muro C, Moyano LM, Gonzalez AE, Garcia HH, O’Neal SE. GPS Tracking of Free-Ranging Pigs to Evaluate Ring Strategies for the Control of Cysticercosis/Taeniasis in Peru. PLoS Negl Trop Dis 2016; 10:e0004591. [PMID: 27035825 PMCID: PMC4818035 DOI: 10.1371/journal.pntd.0004591] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 03/08/2016] [Indexed: 11/18/2022] Open
Abstract
Background Taenia solium, a parasitic cestode that affects humans and pigs, is the leading cause of preventable epilepsy in the developing world. T. solium eggs are released into the environment through the stool of humans infected with an adult intestinal tapeworm (a condition called taeniasis), and cause cysticercosis when ingested by pigs or other humans. A control strategy to intervene within high-risk foci in endemic communities has been proposed as an alternative to mass antihelminthic treatment. In this ring strategy, antihelminthic treatment is targeted to humans and pigs residing within a 100 meter radius of a pig heavily-infected with cysticercosis. Our aim was to describe the roaming ranges of pigs in this region, and to evaluate whether the 100 meter radius rings encompass areas where risk factors for T. solium transmission, such as open human defecation and dense pig activity, are concentrated. Methodology/Principal Findings In this study, we used Global Positioning System (GPS) devices to track pig roaming ranges in two rural villages of northern Peru. We selected 41 pigs from two villages to participate in a 48-hour tracking period. Additionally, we surveyed all households to record the locations of open human defecation areas. We found that pigs spent a median of 82.8% (IQR: 73.5, 94.4) of their time roaming within 100 meters of their homes. The size of home ranges varied significantly by pig age, and 93% of the total time spent interacting with open human defecation areas occurred within 100 meters of pig residences. Conclusions/Significance These results indicate that 100 meter radius rings around heavily-infected pigs adequately capture the average pig’s roaming area (i.e., home range) and represent an area where the great majority of exposure to human feces occurs. Taenia solium, commonly known as the pork tapeworm, is a parasite that affects humans and pigs. It has a disproportionate impact on low and middle income countries, and is most common in rural areas where free-ranging domestic pigs are common, and access to sanitation is limited. Pigs acquire cysticercosis, the larval stage of the disease, when they ingest T. solium eggs that have been released into the environment through the feces of an infected human host. In this study, we tracked free-ranging pigs with GPS devices, and found that most pigs remained close to their owners’ homes throughout the tracking period, and that the majority of pigs’ interactions with open human feces occurred near their owners’ homes. These findings suggest that 100 meter radius rings around heavily-infected pigs capture the most likely area of pig infection, and support focused control interventions in areas surrounding heavily-infected pigs.
Collapse
Affiliation(s)
- Ian W. Pray
- School of Public Health, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Dallas J. Swanson
- School of Public Health, Oregon Health and Science University, Portland, Oregon, United States of America
| | - Viterbo Ayvar
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Claudio Muro
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
| | - Luz M. Moyano
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
- Inserm Neuroépidémiologie Tropicale (NET), Institut d'Epidémiologie et de Neurologie Tropicale (IENT), Faculté de Médecine de l'Université de Limoges, Limoges, France
- Office of Training and Research. Regional Hospital II-2, Tumbes, Peru
| | - Armando E. Gonzalez
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Hector H. Garcia
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
- Department of Microbiology, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Seth E. O’Neal
- School of Public Health, Oregon Health and Science University, Portland, Oregon, United States of America
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, Tumbes, Peru
- * E-mail:
| | | |
Collapse
|
42
|
Brunet K, Minoza A, Portet S, Beraud G, Rodier MH, Cateau E. A 55-Year-Old French Man With Sudden Hemiparesis and Hemiplegia. Clin Infect Dis 2016; 62:777, 807-8. [PMID: 26932935 DOI: 10.1093/cid/civ1192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
43
|
Pajuelo MJ, Eguiluz M, Dahlstrom E, Requena D, Guzmán F, Ramirez M, Sheen P, Frace M, Sammons S, Cama V, Anzick S, Bruno D, Mahanty S, Wilkins P, Nash T, Gonzalez A, García HH, Gilman RH, Porcella S, Zimic M. Identification and Characterization of Microsatellite Markers Derived from the Whole Genome Analysis of Taenia solium. PLoS Negl Trop Dis 2015; 9:e0004316. [PMID: 26697878 PMCID: PMC4689449 DOI: 10.1371/journal.pntd.0004316] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/24/2015] [Indexed: 12/31/2022] Open
Abstract
Background Infections with Taenia solium are the most common cause of adult acquired seizures worldwide, and are the leading cause of epilepsy in developing countries. A better understanding of the genetic diversity of T. solium will improve parasite diagnostics and transmission pathways in endemic areas thereby facilitating the design of future control measures and interventions. Microsatellite markers are useful genome features, which enable strain typing and identification in complex pathogen genomes. Here we describe microsatellite identification and characterization in T. solium, providing information that will assist in global efforts to control this important pathogen. Methods For genome sequencing, T. solium cysts and proglottids were collected from Huancayo and Puno in Peru, respectively. Using next generation sequencing (NGS) and de novo assembly, we assembled two draft genomes and one hybrid genome. Microsatellite sequences were identified and 36 of them were selected for further analysis. Twenty T. solium isolates were collected from Tumbes in the northern region, and twenty from Puno in the southern region of Peru. The size-polymorphism of the selected microsatellites was determined with multi-capillary electrophoresis. We analyzed the association between microsatellite polymorphism and the geographic origin of the samples. Results The predicted size of the hybrid (proglottid genome combined with cyst genome) T. solium genome was 111 MB with a GC content of 42.54%. A total of 7,979 contigs (>1,000 nt) were obtained. We identified 9,129 microsatellites in the Puno-proglottid genome and 9,936 in the Huancayo-cyst genome, with 5 or more repeats, ranging from mono- to hexa-nucleotide. Seven microsatellites were polymorphic and 29 were monomorphic within the analyzed isolates. T. solium tapeworms were classified into two genetic groups that correlated with the North/South geographic origin of the parasites. Conclusions/Significance The availability of draft genomes for T. solium represents a significant step towards the understanding the biology of the parasite. We report here a set of T. solium polymorphic microsatellite markers that appear promising for genetic epidemiology studies. Taenia solium, the pork tapeworm, is an important pathogen as it is a major cause of acquired epilepsy in developing countries. The parasite was eliminated from most developed countries decades ago due to improvement in sanitary conditions but it remains a common infection across Asia, Africa and Latin America. Identification of genetic variants within T. solium will enable to study the genetic epidemiology, distribution and movement of this parasite within endemic communities, which will ultimately facilitate the design of control strategies to reduce the health and economic burden of disease. Microsatellites have been used in other parasites to identify genetic variants. In this study, we partially sequenced the genome of T. solium and identified microsatellites widely distributed in the genome using bioinformatics tools. We evaluated the distribution of these microsatellites collected from 20 tapeworms from the north and 20 tapeworms from the south of Peru. We identified seven polymorphic microsatellites, and evaluated their capacity to differentiate genetic variants of T. solium. Interestingly, tapeworms from the North and South of Peru showed different genotypes, suggesting its use as a potential marker to differentiate geographic origin.
Collapse
Affiliation(s)
- Mónica J. Pajuelo
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - María Eguiluz
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Eric Dahlstrom
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - David Requena
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Frank Guzmán
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Manuel Ramirez
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Patricia Sheen
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Michael Frace
- Biotechnology Core Facility Branch, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Scott Sammons
- Biotechnology Core Facility Branch, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Vitaliano Cama
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Sarah Anzick
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Dan Bruno
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Siddhartha Mahanty
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Patricia Wilkins
- Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
| | - Theodore Nash
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Armando Gonzalez
- Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Héctor H. García
- Departamento de Microbiología, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima Peru
- Instituto Nacional de Ciencias Neurológicas. Lima, Peru
| | - Robert H. Gilman
- Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Steve Porcella
- Genomics Unit, Research Technologies Section, Rocky Mountain Laboratories, NIAID, NIH, Hamilton, Montana, United States of America
| | - Mirko Zimic
- Laboratorio de Bioinformatica y Biologia Molecular, Laboratorios de Investigación y Desarrollo, Facultad de Ciencias y Filosofía, Universidad Peruana Cayetano Heredia, Lima, Peru
- * E-mail:
| | | |
Collapse
|
44
|
Carrillo Mezo R, Lara García J, Arroyo M, Fleury A. Relevance of 3D magnetic resonance imaging sequences in diagnosing basal subarachnoid neurocysticercosis. Acta Trop 2015; 152:60-65. [PMID: 26327445 DOI: 10.1016/j.actatropica.2015.08.017] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 08/21/2015] [Accepted: 08/27/2015] [Indexed: 11/28/2022]
Abstract
Imagenological diagnosis of subarachnoid neurocysticercosis is usually difficult when classical magnetic resonance imaging (MRI) sequences are used. The purpose of this study was to evaluate the advantages of 3D MRI sequences (Fast Imaging Employing Steady-state Acquisition (FIESTA) and Spoiled Gradient Recalled Echo (SPGR)) with respect to classical sequences (Fluid Attenuation Inversion Recovery (FLAIR) and T1) in visualizing Taenia solium cyst in these locations. Forty-seven T. solium cysts located in the basal cisterns of the subarachnoid space were diagnosed in eighteen Mexican patients. A pre-treatment MRI was performed on all patients, and all four sequences (FIESTA, FLAIR, T1 SPGR, and T2) were evaluated independently by two neuroradiologists. The sensitivity of each sequence to detect the parasite membrane and scolex was evaluated, along with its capacity to detect differences in signal intensity between cerebrospinal fluid (CSF) and cysts. FIESTA sequences allowed the visualization of cyst membrane in 87.2% of the parasites evaluated, FLAIR in 38.3%, SPGR in 23.4%, and T2 in 17.0%. The superiority of FIESTA sequences over the other three imaging methods was statistically significant (P<0.001). Scolices were detected by FIESTA twice as much as the other sequences did, although this difference was not significant (P>0.05). Differences in signal intensity between CSF and parasite cysts were significant in FIESTA (P<0.0001), SPGR (P<0.0001), and FLAIR (P=0.005) sequences. For the first time, the usefulness of 3D MRI sequences to diagnose T. solium cysts located in the basal cisterns of the subarachnoid space was demonstrated. The routine use of these sequences could favor an earlier diagnosis and greatly improve the prognosis of patients affected by this severe form of the disease.
Collapse
Affiliation(s)
- Roger Carrillo Mezo
- Neuroradiology Department, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico
| | - Javier Lara García
- Neuroradiology Department, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico
| | - Mariana Arroyo
- Peripheral Unit of Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico; Neurocysticercosis Clinic, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico
| | - Agnès Fleury
- Peripheral Unit of Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico; Neurocysticercosis Clinic, Instituto Nacional de Neurología y Neurocirugía, México, DF, Mexico.
| |
Collapse
|
45
|
Okello AL, Burniston S, Conlan JV, Inthavong P, Khamlome B, Welburn SC, Gilbert J, Allen J, Blacksell SD. Prevalence of Endemic Pig-Associated Zoonoses in Southeast Asia: A Review of Findings from the Lao People's Democratic Republic. Am J Trop Med Hyg 2015; 92:1059-1066. [PMID: 25802431 PMCID: PMC4426289 DOI: 10.4269/ajtmh.14-0551] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 01/19/2015] [Indexed: 12/02/2022] Open
Abstract
The increasing intensification of pork production in southeast Asia necessitates an urgent requirement to better understand the dual impact of pig-associated zoonotic disease on both pig production and human health in the region. Sharing porous borders with five countries and representing many regional ethnicities and agricultural practices, the Lao People's Democratic Republic (Lao PDR) appears well placed to gauge the levels of pig-associated zoonoses circulating in the wider region. Despite this, little is known about the true impact of zoonotic pathogens such as leptospirosis, Trichinella, hepatitis E virus (HEV), Japanese encephalitis (JE), and Taenia solium on human health and livestock production in the country. A comprehensive review of the published prevalences of these five pig-associated zoonoses in Lao PDR has demonstrated that although suspicion remains high of their existence in pig reservoirs across the country, epidemiological data are scarce; only 31 epidemiological studies have been undertaken on these diseases in the past 25 years. A greater understanding of the zoonoses prevalence and subsequent risks associated with pork production in the southeast Asian region could help focus public health and food safety interventions at key points along the value chain, benefiting both livestock producers and the broader animal and human health systems in the region.
Collapse
Affiliation(s)
- Anna L. Okello
- School of Biomedical Sciences, College of Medicine and Veterinary Medicine, The University of Edinburgh, Edinburgh, United Kingdom; School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia; National Animal Health Laboratory, Department of Livestock and Fisheries, Ministry of Agriculture, Vientiane, Lao People's Democratic Republic; Department of Hygiene and Prevention, Ministry of Health, Vientiane, Lao People's Democratic Republic; International Livestock Research Institute, Nairobi, Kenya; Australian Animal Health Laboratory (AAHL), CSIRO Animal, Food and Health Sciences, Geelong, Victoria, Australia; Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand; Centre for Tropical Medicine, Nuffield Department of Clinical Medicine, Churchill Hospital, Oxford, United Kingdom
| | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Zeller L, Barski L, Shleyfer E, Netz U, Stavi V, Abu-Shakra M. Taenia solium in a patient with systemic lupus erythematosus: do parasites protect against autoimmune diseases. Isr Med Assoc J 2015; 17:259-260. [PMID: 26040058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
|
47
|
Croker C. Challenges and opportunities in detecting Taenia solium tapeworm carriers in Los Angeles County California, 2009-2014. J Epidemiol Glob Health 2015; 5:359-63. [PMID: 25814395 PMCID: PMC7320498 DOI: 10.1016/j.jegh.2015.02.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 02/25/2015] [Accepted: 02/27/2015] [Indexed: 11/29/2022] Open
Abstract
Carriers of the pork tapeworm, Taenia solium, are the sole source of neurocysticercosis, a parasitic tissue infection that can be chronic and severe. Identifying T. solium tapeworm carriers is challenging. Many are asymptomatic and go undetected and unreported. In addition, T. solium is difficult to distinguish from other Taenia species of less concern. From 2009 to 2014, 24 taeniasis cases were reported to the Los Angeles County (LAC) Department of Public Health. Twenty reports were received solely from our automated electronic laboratory reporting system (ELR), two from health care providers, and two were generated internally from investigation of households with a reported neurocysticercosis case. Further investigation identified one T. solium carrier originally reported by ELR and one identified from a neurocysticercosis case investigation. These results suggest that T. solium tapeworm carriers can be identified from investigation of ELR reports of unspeciated Taenia cases as well as from households of neurocysticercosis cases.
Collapse
Affiliation(s)
- Curtis Croker
- Acute Communicable Disease Control Program, Los Angeles County Department of Public Health, 313 N. Figueroa St. Room 222, Los Angeles, CA 90012, USA.
| |
Collapse
|
48
|
Watts NS, Pajuelo M, Clark T, Loader MCI, Verastegui MR, Sterling C, Friedland JS, Garcia HH, Gilman RH. Taenia solium infection in Peru: a collaboration between Peace Corps Volunteers and researchers in a community based study. PLoS One 2014; 9:e113239. [PMID: 25469506 PMCID: PMC4254459 DOI: 10.1371/journal.pone.0113239] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2014] [Accepted: 09/22/2014] [Indexed: 11/26/2022] Open
Abstract
Background Neurocysticercosis is a leading cause of seizures and epilepsy in most of the world, and it occurs when Taenia solium larval cysts infect the central nervous system. T. solium tapeworm infection is endemic in much of Peru, but there are scarce data on the prevalence in many rural highland communities where it is likely to be hyper-endemic. Peace Corps Volunteers live and work in these communities; however, to our knowledge, they have not been used to facilitate public health research. Materials and Methods We utilized Peace Corps Volunteers to estimate the prevalence of T. solium tapeworm infection in seven rural communities in northern Peru. A convenience non-random sampling frame was used. Peace Corps Volunteers facilitated the collection of stool samples (N = 2,328), which were analyzed by sedimentation and microscopy. Niclosamide treatment and purgation preceded species identification, which was done by PCR-REA. Results Taenia sp. egg-positive stool samples were found in three of the seven communities we surveyed. The overall prevalence of Taenia sp. egg positivity was 2.1% (49/2,328) (95% CI = 1.6–2.8%) with prevalence up to 4.3% (42/977) (95% CI = 3.1–5.8%) by community. All 34 of the specimens tested by PCR-REA were T. solium. The overall prevalence of T. solium tapeworm infection was 1.5% (34/2,328) (95% CI = 1.0–2.0%). Prevalence up to 2.9% (28/977) (95% CI = 1.9–4.1%) by community was observed. Conclusion/Significance This study recorded high T. solium tapeworm prevalence, and identified hyper-endemic rural communities. It demonstrates that synergy between researchers and Peace Corps Volunteers can be an effective means to conducting large-scale, community-based studies in remote areas of Peru.
Collapse
Affiliation(s)
- Nathaniel S. Watts
- Department of Epidemiology, Boston University School of Public Health, Boston, United States of America
- * E-mail:
| | - Monica Pajuelo
- Unit of Bioinformatics and Molecular Biology, School of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Taryn Clark
- Weill Cornell Medical College, New York, United States of America
| | - Maria-Cristina I. Loader
- Infectious Diseases & Immunity and the Wellcome Trust-Imperial Centre for Global Health, Imperial College London, London, England, United Kingdom
| | - Manuela R. Verastegui
- Department of Microbiology, School of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Charles Sterling
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, United States of America
| | - Jon S. Friedland
- Infectious Diseases & Immunity and the Wellcome Trust-Imperial Centre for Global Health, Imperial College London, London, England, United Kingdom
| | - Hector H. Garcia
- Department of Microbiology, School of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Robert H. Gilman
- Asociación Benéfica Proyectos en Informática, Salud, Medicina y Agricultura (AB PRISMA), Lima, Peru
- Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, United States of America
| | | |
Collapse
|
49
|
|
50
|
Abstract
The infection of the nervous system by the cystic larvae of Taenia solium (neurocysticercosis) is a frequent cause of seizure disorders. Neurocysticercosis is endemic or presumed to be endemic in many low-income countries. The lifecycle of the worm and the clinical manifestations of neurocysticercosis are well established, and CT and MRI have substantially improved knowledge of the disease course. Improvements in immunodiagnosis have further advanced comprehension of the pathophysiology of this disease. This knowledge has led to individualised treatment approaches that account for the involvement of parenchymal or extraparenchymal spaces, the number and form of parasites, and the extent of degeneration and associated inflammation. Clinical investigations are focused on development of effective treatments and reduction of side-effects induced by treatment, such as seizures, hydrocephalus, infarcts, and neuroinjury.
Collapse
Affiliation(s)
- Hector H Garcia
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurológicas, Lima, Peru; Centre for Global Health-Tumbes and Department of Microbiology, School of Sciences, Universidad Peruana Cayetano Heredia, Lima, Peru.
| | - Theodore E Nash
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Oscar H Del Brutto
- School of Medicine, Universidad Espíritu Santo-Ecuador, Guayaquil, Ecuador; Department of Neurological Sciences, Hospital-Clínica Kennedy, Guayaquil, Ecuador
| |
Collapse
|