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Arroyo G, Toribio L, Garrido S, Chile N, Lopez-Urbina T, Gomez-Puerta LA, Muro M, Gilman RH, Castillo Y, Dorny P, O'Neal SE, Gonzalez AE, Garcia HH. Concordance between two monoclonal antibody-based antigen detection enzyme-linked immunosorbent assays for measuring cysticercal antigen levels in sera from pigs experimentally infected with Taenia solium and Taenia hydatigena. Parasit Vectors 2024; 17:172. [PMID: 38566124 PMCID: PMC10988810 DOI: 10.1186/s13071-024-06197-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Accepted: 02/15/2024] [Indexed: 04/04/2024] Open
Abstract
BACKGROUND Antigen detection in Taenia solium cysticercosis confirms viable infection in the intermediate host (either pig or human). The reference B158/B60 monoclonal antibody (mAb)-based Ag-enzyme-linked immunosorbent assay (ELISA) has acceptable levels of sensitivity and specificity in human neurocysticercosis with multiple brain cysts, although its sensitivity is lower in cases with single brain cysts, whereas in porcine cysticercosis the assay specificity is affected by its frequent cross-reaction with Taenia hydatigena, another common cestode found in pigs. Our group has produced 21 anti-T. solium mAbs reacting against antigens of the whole cyst, vesicular fluid, and secretory/excretory products, identifying TsW8/TsW5 as the most promising pair of mAbs for an Ag-ELISA. METHODS We report the use of the TsW8/TsW5 Ag-ELISA to measure cysticercus antigen levels [expressed as optical density (OD) values] in two panels of sera collected from day 0 (baseline) to day 90 postinfection (PI) from pigs experimentally infected with T. solium (n = 26) and T. hydatigena (n = 12). At baseline and on days 28 and 90 PI, we used Bland-Altman (BA) analysis and Lin's concordance correlation coefficients (CCC) to determine the concordance between the TsW8/TsW5 and the B158/B60 Ag-ELISA. RESULTS The TsW8/TsW5 Ag-ELISA was able to efficiently measure circulating antigen levels in T. solium-infected pigs, similar to that obtained with the B158/B60 Ag-ELISA. Almost all paired log-OD differences between assays were within the limits of agreement (LoA) in the BA analysis at baseline and on days 28 and 90 PI (92.3%, 100%, and 100%, respectively), and a high concordance of log-ODs between assays was also found (Lin's CCC: 0.69, 0.92, and 0.96, respectively, all P < 0.001). In pigs infected with T. hydatigena, almost all paired log-OD differences were within the LoA in the BA analysis, whereas the concordance of log-ODs between assays was low at baseline (Lin's CCC: 0.24) but increased on days 28 and 90 PI (Lins' CCC: 0.88 and 0.98, P < 0.001). CONCLUSIONS/SIGNIFICANCE The TsW8/TsW5 Ag-ELISA recognizes antigens in pigs with T. solium cysticercosis and is highly concordant with the B158/B60 Ag-ELISA. However, its diagnostic use is hampered by cross-reactions with T. hydatigena, as in other mAb-based Ag-ELISAs.
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Affiliation(s)
- Gianfranco Arroyo
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru.
- Direccion General de Investigacion, Desarrollo e Innovacion, Universidad Cientifica del Sur, Lima, Peru.
| | - Luz Toribio
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Sara Garrido
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Nancy Chile
- Laboratory of Infectious Diseases, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Teresa Lopez-Urbina
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Luis A Gomez-Puerta
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Miguel Muro
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Robert H Gilman
- Department of International Health, Bloomberg School of Public Health, John Hopkins University, Baltimore, MD, USA
| | - Yesenia Castillo
- Parasite Immunology Laboratory, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Pierre Dorny
- Department of Biomedical Sciences, Institute of Tropical Medicine, Antwerp, Belgium
| | - Seth E O'Neal
- School of Public Health, Oregon Health and Science University-Portland State University, Portland, OR, USA
| | - Armando E Gonzalez
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Hector H Garcia
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
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Gonzalez-Alcaide G, Sosa N, Shevy L, Belinchon-Romero I, Ramos-Rincon JM. Global research on cysticercosis and neurocysticercosis: A bibliometric analysis. Front Vet Sci 2023; 10:1156834. [PMID: 37113561 PMCID: PMC10126342 DOI: 10.3389/fvets.2023.1156834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 03/22/2023] [Indexed: 04/29/2023] Open
Abstract
Background Cysticercosis is a parasitic infection caused by the larval stage Taenia solium. As a neglected tropical disease that is also difficult to diagnose, cysticercosis constitutes an important public health and research challenge. To characterize the development of research on cysticercosis and neurocysticercosis, considering the level of scientific evidence provided and the contribution of different countries to research, according to their endemic nature and their income level. Methods Indexed publications on cysticercosis and neurocysticercosis were retrieved from the MEDLINE database, and the evolution of scientific production and the topic areas addressed in the body of research were analyzed. Results A total of 7,860 papers published between 1928 and 2021 were analyzed. The volume of annual publications increased over time, standing at over 200 documents/year since 2010. Case studies constitute the main study design (27.4% of the documents with available information, n = 2,155), with fewer studies that provide the highest levels of scientific evidence, such as clinical studies (1.9%, n = 149) or systematic reviews (0.8%, n = 63). The most productive journals belong to the Parasitology and Tropical Medicine categories. Although the USA is the most productive country (n = 2,292), countries where Tenia solium is endemic, such as India (n = 1,749), Brazil (n = 941) and Peru (n = 898) also stand out, as does Mexico (n = 1,414). However, other endemic countries in Latin America and sub-Saharan Africa show little participation in the research. The level of international collaboration by country is very uneven, with some countries presenting very low values, such as India (9.9% of documents in international collaboration) or Brazil (18.7%); while there is evidence of intense international collaboration in countries like Peru (91.3%), Tanzania (88.2%) or Kenya (93.1%). Research output has coalesced in three thematic clusters: basic research in animals; parasitism, animal health, and zoonoses; and the diagnosis and therapeutic approach in diseases associated with cysticercosis and neurocysticercosis. Conclusions The generation of knowledge on cysticercosis presents different features from other areas of research, such as the outstanding contribution of only some endemic countries; and the relevance of comprehensive approaches to research (animal and human health). Studies that provide higher levels of scientific evidence should be promoted, as should research in endemic areas.
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Affiliation(s)
| | - Nestor Sosa
- Infectious Diseases Division, Internal Medicine Department, New Mexico University Health Sciences Center, Albuquerque, NM, United States
| | - Laura Shevy
- Infectious Diseases Division, Internal Medicine Department, New Mexico University Health Sciences Center, Albuquerque, NM, United States
| | - Isabel Belinchon-Romero
- Department of Clinical Medicine, Miguel Hernández University, and Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain
| | - Jose-Manuel Ramos-Rincon
- Department of Clinical Medicine, Miguel Hernández University, and Alicante Institute for Health and Biomedical Research (ISABIAL), Alicante, Spain
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Steyn TJS, Awala AN, de Lange A, Raimondo JV. What Causes Seizures in Neurocysticercosis? Epilepsy Curr 2022; 23:105-112. [PMID: 37122403 PMCID: PMC10131564 DOI: 10.1177/15357597221137418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Neurocysticercosis (NCC) is the most prevalent parasitic infection of the central nervous system. It is caused by the presence of larvae of the cestode Taenia solium in the brain. The most common symptom of NCC is seizures, and it is widely considered the world’s leading cause of preventable epilepsy. Despite the prevalence and impact of NCC, a thorough, mechanistic understanding of seizure generation is still lacking. In this review, we address the question “What causes seizures in NCC?” by summarizing and discussing the major theories that seek to explain the seizurogenic and epileptogenic processes in this disorder. In addition, we highlight the potential for recent advances in disease modeling to help accelerate progress in this area.
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Affiliation(s)
- Teresa Julieta Simões Steyn
- Division of Cell Biology, Department of Human Biology, Neuroscience Institute and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Western Cape, South Africa
| | - Amalia Naita Awala
- Division of Cell Biology, Department of Human Biology, Neuroscience Institute and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Western Cape, South Africa
| | - Anja de Lange
- Division of Cell Biology, Department of Human Biology, Neuroscience Institute and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Western Cape, South Africa
| | - Joseph Valentino Raimondo
- Division of Cell Biology, Department of Human Biology, Neuroscience Institute and Institute of Infectious Disease and Molecular Medicine, Faculty of Health Sciences, University of Cape Town, Western Cape, South Africa
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Garcia HH, Verastegui MR, Arroyo G, Bustos JA, Gilman RH. New animal models of neurocysticercosis can help understand epileptogenesis in neuroinfection. Front Mol Neurosci 2022; 15:1039083. [PMID: 36466808 PMCID: PMC9708716 DOI: 10.3389/fnmol.2022.1039083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 10/27/2022] [Indexed: 11/18/2022] Open
Affiliation(s)
- Hector H. Garcia
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru,Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru,Asociación Benéfica PRISMA, Lima, Peru,*Correspondence: Hector H. Garcia
| | - Manuela R. Verastegui
- Alberto Cazorla School of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Gianfranco Arroyo
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru,Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
| | - Javier A. Bustos
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru,Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
| | - Robert H. Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
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Sitali MC, Schmidt V, Mwenda R, Sikasunge CS, Mwape KE, Simuunza MC, da Costa CP, Winkler AS, Phiri IK. Experimental animal models and their use in understanding cysticercosis: A systematic review. PLoS One 2022; 17:e0271232. [PMID: 35853079 PMCID: PMC9295976 DOI: 10.1371/journal.pone.0271232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Accepted: 06/24/2022] [Indexed: 12/09/2022] Open
Abstract
BACKGROUND Cysticercosis and Neurocysticercosis (NCC) can be studied using several animal species in experimental models which contributes to the understanding of the human form of the disease. Experimental infections of Taenia spp. are vital in explaining the modes of transmission of the parasite and helps the understanding of transmission of the parasite in humans and thus may be useful in designing therapeutic and immune-prophylactic studies to combat the disease. Thus, this systematic review aims to explore the existing experimental animal models to the understanding of cysticercosis in both humans and animals and elucidate the risk factors of cysticercosis and identify the Taenia spp. used in these models. METHODOLOGY We systematically identified all publications from the Web of Science, Google Scholar, and Pubmed regarding experimental animal models using Taenia spp. that cause cysticercosis in both humans and animals. 58 studies were identified for eligibility. Of these, only 48 studies met the inclusion criteria from which data extraction was done and presented descriptively. RESULTS Pigs, cattle, gerbils, mice, rats, voles, monkeys, cats, dogs, and goats were used in which T. solium, T. saginata, T. saginata asiatica, T. crassiceps and T. asiatica were studied. The routes used to induce disease were; oral, intravenous, subcutaneous, intramuscular, intraperitoneal, intraarterial, intracranial, intraduodenal, and surgical routes using eggs, oncospheres, and proglottids. Besides, the establishment of infection using eggs and oncospheres was affected by the route used to induce infection in the experimental animals. The cysticerci recovery rate in all the experimental studies was low and the number of animals used in these experiments varied from 1 to 84. Although not analysed statistically, sex, age, and breed of animals influenced the cysticerci recovery rate. Additionally, the cysticerci recovery rate and antibody-antigen levels were shown to increase with an increase in the dose of oncospheres and eggs inoculated in the animals. Contrasting results were reported in which the cysticerci recovery rate decreased with an increase in the dose of eggs inoculated. CONCLUSION This review describes the various animal experiments using Taenia species that cause cysticercosis highlighting the animals used, age and their breed, the routes of infection used to induce disease and the sample size used, and the cysticerci recovery rate in these animal models.
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Affiliation(s)
- Muloongo C. Sitali
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Veronika Schmidt
- Centre for Global Health, Institute of Health and Society, University of Oslo, Oslo, Norway
| | - Racheal Mwenda
- Department of Paraclinical Studies, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Chummy S. Sikasunge
- Department of Paraclinical Studies, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Kabemba E. Mwape
- Department of Clinical Studies, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Martin C. Simuunza
- Department of Disease Control, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Clarissa P. da Costa
- Institute for Medical Microbiology, Immunology and Hygiene, Technical University of Munich, Munich, Germany
| | - Andrea S. Winkler
- Department of Neurology, Centre for Global Health, Klinikum Rechts der Isar, Technical University Munich, Munich, Germany
| | - Isaac K. Phiri
- Department of Clinical Studies, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
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Sota KA, Bustos JA, Verastegui MR, Toribio L, Chile N, Angulo N, Cangalaya C, Calcina J, González AE, Gilman RH, García HH. Experimental brain infection with cysticercosis in sheep. Rev Peru Med Exp Salud Publica 2022; 39:328-335. [PMID: 36478166 PMCID: PMC9899549 DOI: 10.17843/rpmesp.2022.393.11039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 09/13/2022] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVE. To explore the feasibility of developing a sheep model of neurocysticercosis (NCC) by intracranial infection with T. solium oncospheres. MATERIALS AND METHODS. We carried out an experimental infection model of NCC in sheep. Approximately 10 T. solium oncospheres previously cultured for 30 days were inoculated intracranially into ten sheep. The oncospheres, in 0.1 mL of physiological saline, were injected into the parietal lobe through an 18-gauge needle. RESULTS. After three months, granulomas were found in two sheep. In a third sheep we identified a 5 mm diameter cyst in the right lateral ventricle and histological evaluation confirmed that the cyst corresponded to a T. solium larva. Immunohistochemistry with monoclonal antibodies directed against membrane components and excretory/secretory antigens of the T. solium cyst was also used to confirm the etiology of the found granulomas. One of them showed reactivity to the monoclonal antibodies used, thus confirming that it was a cysticercus. CONCLUSION. This experiment is the proof of concept that it is possible to infect sheep with cysticercosis by intracranial inoculation.
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Affiliation(s)
- Katherine A Sota
- Unidad de Cisticercosis, Instituto Nacional de Ciencias Neurológicas, Lima, Perú
| | - Javier A Bustos
- Unidad de Cisticercosis, Instituto Nacional de Ciencias Neurológicas, Lima, Perú
- Centro de Salud Global, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Manuela R Verastegui
- Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Luz Toribio
- Centro de Salud Global, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Nancy Chile
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, US
| | - Noelia Angulo
- Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Carla Cangalaya
- Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Juan Calcina
- Escuela de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima, Perú
| | - Armando E González
- Escuela de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima, Perú
| | - Robert H Gilman
- Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, US
| | - Héctor H García
- Unidad de Cisticercosis, Instituto Nacional de Ciencias Neurológicas, Lima, Perú
- Centro de Salud Global, Universidad Peruana Cayetano Heredia, Lima, Perú
- Laboratorios de Investigación y Desarrollo, Universidad Peruana Cayetano Heredia, Lima, Perú
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Arroyo G, Toribio L, Vargas-Calla A, Calcina JF, Bernal E, Chile N, Zambrano M, Gomez-Puerta LA, Chacaltana J, Marzal M, Bustos JA, Verastegui MR, Gilman RH, O’Neal SE, Gonzalez AE, Garcia HH. Porcine model of neurocysticercosis by intracarotid injection of Taenia solium oncospheres: Dose assessment, infection outcomes and serological responses. PLoS Negl Trop Dis 2022; 16:e0010449. [PMID: 35653367 PMCID: PMC9162370 DOI: 10.1371/journal.pntd.0010449] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 04/26/2022] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Neurocysticercosis (NCC) is the infection of the human central nervous system (CNS) by Taenia solium larvae that cause significant neurological morbidity. Studies on NCC pathophysiology, host-parasite interactions or therapeutic agents are limited by the lack of suitable animal models. We have previously reported that carotid injection of activated T. solium oncospheres directs parasites into the CNS and consistently reproduces NCC. This study assessed the minimal dose required to consistently obtain NCC by intracarotid oncosphere injection and compared antigen and antibody response profiles by dose-group. METHODS/PRINCIPAL FINDINGS Three groups of pigs were infected with either 2500 (n = 10), 5000 (n = 11), or 10000 (n = 10) oncospheres. Two pigs died during the study. Necropsy exam at day 150 post-infection (PI) demonstrated viable NCC in 21/29 pigs (72.4%), with higher NCC rates with increasing oncosphere doses (4/9 [44.4%], 9/11 [81.8%] and 8/9 [88.9%] for 2500, 5000, and 10000 oncospheres respectively, P for trend = 0.035). CNS cyst burden was also higher in pigs with increasing doses (P for trend = 0.008). Viable and degenerated muscle cysticerci were also found in all pigs, with degenerated cysticerci more frequent in the 2500 oncosphere dose-group. All pigs were positive for circulating parasite antigens on ELISA (Ag-ELISA) from day 14 PI; circulating antigens markedly increased at day 30 PI and remained high with plateau levels in pigs infected with either 5000 or 10000 oncospheres, but not in pigs infected with 2500 oncospheres. Specific antibodies appeared at day 30 PI and were not different between dose-groups. CONCLUSION/SIGNIFICANCE Intracarotid injection of 5000 or more oncospheres produces high NCC rates in pigs with CNS cyst burdens like those usually found in human NCC, making this model appropriate for studies on the pathogenesis of NCC and the effects of antiparasitic treatment.
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Affiliation(s)
- Gianfranco Arroyo
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
| | - Luz Toribio
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- * E-mail:
| | - Ana Vargas-Calla
- Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Juan F. Calcina
- Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Edson Bernal
- Infectious Diseases Laboratory Research-LID, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Nancy Chile
- Infectious Diseases Laboratory Research-LID, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Miguel Zambrano
- Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Luis A. Gomez-Puerta
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Juan Chacaltana
- Department of Imaging Diagnosis, Instituto Nacional de Ciencias Neurologicas de Lima, Lima, Peru
| | - Miguel Marzal
- School of Medical Technology, Faculty of Medicine, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Javier A. Bustos
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
| | - Manuela R. Verastegui
- Infectious Diseases Laboratory Research-LID, Faculty of Sciences and Philosophy, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - Robert H. Gilman
- Department of International Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Seth E. O’Neal
- School of Public Health, Oregon Health & Sciences University-Portland State University, Portland, Oregon, United States of America
| | - Armando E. Gonzalez
- Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Hector H. Garcia
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurologicas, Lima, Peru
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Andrade-Mogrovejo DA, Gonzales-Gustavson E, Ho-Palma AC, Prada JM, Bonnet G, Pizzitutti F, Gomez-Puerta LA, Arroyo G, O’Neal SE, Garcia HH, Guitian J, Gonzalez A. Development of a dose-response model for porcine cysticercosis. PLoS One 2022; 17:e0264898. [PMID: 35286329 PMCID: PMC8920259 DOI: 10.1371/journal.pone.0264898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 02/21/2022] [Indexed: 01/11/2023] Open
Abstract
Taenia solium is an important cause of acquired epilepsy worldwide and remains endemic in Asia, Africa, and Latin America. Transmission of this parasite is still poorly understood despite the design of infection experiments to improve our knowledge of the disease, with estimates for critical epidemiological parameters, such as the probability of human-to-pig infection after exposure to eggs, still lacking. In this paper, a systematic review was carried out and eight pig infection experiments were analyzed to describe the probability of developing cysts. These experiments included different pathways of inoculation: with ingestion of proglottids, eggs, and beetles that ingested eggs, and direct injection of activated oncospheres into the carotid artery. In these experiments, different infective doses were used, and the numbers of viable and degenerated cysts in the body and brain of each pig were registered. Five alternative dose-response models (exponential, logistic, log-logistic, and exact and approximate beta-Poisson) were assessed for their accuracy in describing the observed probabilities of cyst development as a function of the inoculation dose. Dose-response models were developed separately for the presence of three types of cysts (any, viable only, and cysts in the brain) and considered for each of the four inoculation methods ("Proglottids", "Eggs", "Beetles" and "Carotid"). The exact beta-Poisson model best fit the data for the three types of cysts and all relevant exposure pathways. However, observations for some exposure pathways were too scarce to reliably define a dose-response curve with any model. A wide enough range of doses and sufficient sample sizes was only found for the "Eggs" pathway and a merged "Oral" pathway combining the "Proglottids", "Eggs" and "Beetles" pathways. Estimated parameter values from this model suggest that a low infective dose is sufficient to result in a 50% probability for the development of any cyst or for viable cyst infections. Although this is a preliminary model reliant on a limited dataset, the parameters described in this manuscript should contribute to the design of future experimental infections related to T. solium transmission, as well as the parameterization of simulation models of transmission aimed at informing control.
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Affiliation(s)
- Daniel A. Andrade-Mogrovejo
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Eloy Gonzales-Gustavson
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
- Tropical and Highlands Veterinary Research Institute, Universidad Nacional Mayor de San Marcos, Lima, Peru
- * E-mail:
| | - Ana C. Ho-Palma
- Department of Human Medicine, School of Human Medicine, Universidad Nacional del Centro del Perú, Huancayo, Peru
| | - Joaquín M. Prada
- Department of Veterinary Epidemiology and Public Health, Faculty of Health and Medical Sciences, University of Surrey, Guildford, United Kingdom
| | - Gabrielle Bonnet
- 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
| | - Luis A. Gomez-Puerta
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Gianfranco Arroyo
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, San Martín de Porres, 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, San Martín de Porres, Peru
| | - Hector H. Garcia
- Center for Global Health Tumbes, Universidad Peruana Cayetano Heredia, San Martín de Porres, Peru
- Cysticercosis Unit, National Institute of Neurological Sciences, Lima, Peru
| | - Javier Guitian
- Veterinary Epidemiology, Economics and Public Health Group, Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hertfordshire, United Kingdom
| | - Armando Gonzalez
- Department of Animal and Public Health, School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
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9
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Garcia HH, Gonzalez AE, Gilman RH. Taenia solium Cysticercosis and Its Impact in Neurological Disease. Clin Microbiol Rev 2020; 33:e00085-19. [PMID: 32461308 PMCID: PMC7254859 DOI: 10.1128/cmr.00085-19] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Taenia solium neurocysticercosis (NCC) is endemic in most of the world and contributes significantly to the burden of epilepsy and other neurological morbidity. Also present in developed countries because of immigration and travel, NCC is one of few diseases targeted for eradication. This paper reviews all aspects of its life cycle (taeniasis, porcine cysticercosis, human cysticercosis), with a focus on recent advances in its diagnosis, management, and control. Diagnosis of taeniasis is limited by poor availability of immunological or molecular assays. Diagnosis of NCC rests on neuroimaging findings, supported by serological assays. The treatment of NCC should be approached in the context of the particular type of infection (intra- or extraparenchymal; number, location, and stage of lesions) and has evolved toward combined symptomatic and antiparasitic management, with particular attention to modulating inflammation. Research on NCC and particularly the use of recently available genome data and animal models of infection should help to elucidate mechanisms of brain inflammation, damage, and epileptogenesis.
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Affiliation(s)
- Hector H Garcia
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- Cysticercosis Unit, Instituto Nacional de Ciencias Neurológicas, Lima, Peru
| | - Armando E Gonzalez
- Center for Global Health, Universidad Peruana Cayetano Heredia, Lima, Peru
- School of Veterinary Medicine, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - Robert H Gilman
- Department of International Health, Johns Hopkins School of Public Health, Baltimore, Maryland, USA
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Hydrocephalus in Neurocysticercosis: Challenges for Clinical Practice and Basic Research Perspectives. World Neurosurg 2019; 126:264-271. [DOI: 10.1016/j.wneu.2019.03.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/06/2019] [Accepted: 03/07/2019] [Indexed: 11/19/2022]
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