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Liravizadeh S, Abdolahi Khabisi S, Salimi Khorashad A, Mirahmadi H. Molecular Determination of Toxocara spp. Eggs Isolated from Public Parks and Playgrounds in Zahedan, Southeast Iran. J Parasitol Res 2024; 2024:2132696. [PMID: 38939904 PMCID: PMC11208816 DOI: 10.1155/2024/2132696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 04/15/2024] [Accepted: 05/06/2024] [Indexed: 06/29/2024] Open
Abstract
Background Human toxocariasis (HT) is a zoonotic disease with a global expansion. Contaminated soil with Toxocara spp. eggs is the main source of human infection, which may lead to severe complications depending on the organs invaded by migrating larvae. Aim This study is aimed at eliciting the prevalence of Toxocara spp. eggs in public parks in Zahedan, southeast Iran, and providing new insight into the soil contamination rate in this area using microscopic and molecular methods. Methods Based on five municipal districts, 240 soil samples were collected from public parks and playgrounds in Zahedan. The modified Sheather's flotation technique was employed to isolate Toxocara spp. eggs from the soil, followed by microscopic assessment and molecular evaluation of internal transcribed spacer 1 and 2 ribosomal deoxyribonucleic acid (ITS1 and 2 rDNA) using nested polymerase chain reaction (nested PCR) to identify the presence of Toxocara spp. eggs. The Sanger sequence was used to differentiate the Toxocara species. Subsequently, all the sequenced data were blasted and compared with other sequences available in the GenBank. Results Out of 240 soil samples collected, 7 (2.9%) samples were identified to contain Toxocara spp. eggs using Sheather's flotation and microscopic techniques. Meanwhile, 19 (7.9%) samples were positive using nested PCR. According to the Sanger sequencing analysis findings, all positive samples were contaminated with Toxocara cati. Conclusion As evidenced by the obtained results, only T. cati species were detected in public parks and playgrounds in Zahedan; therefore, control and prevention programs against this species should be considered in human and animal communities.
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Affiliation(s)
- Siavash Liravizadeh
- Department of Parasitology and MycologyFaculty of MedicineZahedan University of Medical Sciences, Zahedan, Iran
| | - Samaneh Abdolahi Khabisi
- Department of Parasitology and MycologyFaculty of MedicineZahedan University of Medical Sciences, Zahedan, Iran
| | - Alireza Salimi Khorashad
- Department of Parasitology and MycologyFaculty of MedicineZahedan University of Medical Sciences, Zahedan, Iran
| | - Hadi Mirahmadi
- Department of Parasitology and MycologyFaculty of MedicineZahedan University of Medical Sciences, Zahedan, Iran
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Ebrahimipour M, Parsa H, Kianifard N, Nasibi S, Rostami A. Understanding the research and practical needs required to control toxocariasis in Iran. Parasite Epidemiol Control 2024; 25:e00351. [PMID: 38708129 PMCID: PMC11067375 DOI: 10.1016/j.parepi.2024.e00351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 03/08/2024] [Accepted: 04/21/2024] [Indexed: 05/07/2024] Open
Abstract
Human toxocariasis (HT) is a widespread zoonotic infection globally, notably prevalent in tropical areas. Enhancing our understanding of toxocariasis can lead to increased attention towards the socioeconomic impact and control of this neglected zoonosis. We conducted a comprehensive review of all available articles and official documents on toxocariasis in Iran to identify research gaps and critical needs for its control. This review highlights that despite numerous studies exploring various aspects of toxocariasis in definitive and paratenic hosts, as well as humans and environmental contamination, significant data deficiencies and gaps persist across different regions in the country. These gaps involve investigating the worm burden and reinfection rates in definitive hosts, developing more sensitive methods to detect and differentiate of Toxocara species, and understanding the behavior of definitive host animals. Additionally, identifying potential paratenic hosts for HT and exploring the organ-specific affinity and survival duration of Toxocara larvae within these hosts are essential areas for exploration. It's also imperative to comprehend the sylvatic and domestic cycles of the parasite in paratenic hosts. Furthermore, assessing egg density in the environment, exploring potential new sources such as water, and identifying regions with optimal climatic conditions for the survival and development of Toxocara eggs are crucial for the formulation of effective prevention and control strategies. Identifying at-risk groups, developing early diagnosis techniques, employing imaging methods, and identifying long-term complications in humans are also crucial. Community health organizations should prioritize health education for the public and professionals. Furthermore, accurately estimating definitive host populations, monitoring and preventing their movements in public places, implementing regular deworming practices for pets and stray hosts, and recognizing the infection's significance as a health priority are critical. This comprehensive understanding advocates for a holistic "one health" approach to control of HT.
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Affiliation(s)
- Mohammad Ebrahimipour
- Research Center for Hydatid Disease in Iran, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Hamid Parsa
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Nazanin Kianifard
- School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saeid Nasibi
- Research Center for Hydatid Disease in Iran, School of Medicine, Kerman University of Medical Sciences, Kerman, Iran
| | - Ali Rostami
- Infectious Diseases and Tropical Medicine Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
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Aragón-Franco R, Ruiz-Manzano RA, Nava-Castro KE, Del Rìo Araiza VH, Garay-Canales CA, Pérez-Torres A, Chacón-Salinas R, Girón-Pérez MI, Morales-Montor J. Convergence between helminths and breast cancer: intratumoral injection of the excretory/secretory antigens of the human parasite Toxocara canis (EST) increase lung macro and micro metastasis. Front Immunol 2024; 15:1332933. [PMID: 38576624 PMCID: PMC10993691 DOI: 10.3389/fimmu.2024.1332933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 02/21/2024] [Indexed: 04/06/2024] Open
Abstract
Introduction Worldwide, breast cancer is the most important cancer in incidence and prevalence in women. Different risk factors interact to increase the probability of developing it. Biological agents such as helminth parasites, particularly their excretory/secretory antigens, may play a significant role in tumor development. Helminths and their antigens have been recognized as inducers or promoters of cancer due to their ability to regulate the host's immune response. Previously in our laboratory, we demonstrated that chronic infection by Toxocara canis increases the size of mammary tumors, affecting the systemic response to the parasite. However, the parasite does not invade the tumor, and we decided to study if the excretion/secretion of antigens from Toxocara canis (EST) can affect the progression of mammary tumors or the pathophysiology of cancer which is metastasis. Thus, this study aimed to determine whether excretion/secretion T. canis antigens, injected directly into the tumor, affect tumor growth and metastasis. Methods We evaluated these parameters through the monitoring of the intra-tumoral immune response. Results Mice injected intratumorally with EST did not show changes in the size and weight of the tumors; although the tumors showed an increased microvasculature, they did develop increased micro and macro-metastasis in the lung. The analysis of the immune tumor microenvironment revealed that EST antigens did not modulate the proportion of immune cells in the tumor, spleen, or peripheral lymph nodes. Macroscopic and microscopic analyses of the lungs showed increased metastasis in the EST-treated animals compared to controls, accompanied by an increase in VEGF systemic levels. Discussion Thus, these findings showed that intra-tumoral injection of T. canis EST antigens promote lung metastasis through modulation of the tumor immune microenvironment.
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Affiliation(s)
- Raúl Aragón-Franco
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional (ENCB-IPN), Ciudad de México, Mexico
| | - Rocío Alejandra Ruiz-Manzano
- Laboratorio de Neuroinmunoendocrinología, Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Karen Elizabeth Nava-Castro
- Laboratorio de Biología y Química Atmosférica, Departamento de Ciencias Ambientales, Instituto de Ciencias de la Atmósfera y Cambio Climático, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Víctor Hugo Del Rìo Araiza
- Laboratorio de Interacciones Endocrinoinmunitarias en Enfermedades Parasitarias, Facultad de Medicina Veterinaria y Zootecnia, Departamento de Parasitología, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Claudia Angelica Garay-Canales
- Laboratorio de Neuroinmunoendocrinología, Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Armando Pérez-Torres
- Departamento de Biologia Celular y Tisular, Facultad de Medicina, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Romel Chacón-Salinas
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional (ENCB-IPN), Ciudad de México, Mexico
| | - Manuel Iván Girón-Pérez
- Laboratorio de Inmunotoxicología, Secretaría de Investigación y Posgrado, Universidad Autónoma de Nayarit, Tepic, Nayarit, Mexico
| | - Jorge Morales-Montor
- Laboratorio de Neuroinmunoendocrinología, Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
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Elgendy DI, Elmahy RA, Amer AIM, Ibrahim HA, Eltantawy AF, Mansour FR, Salama AM. Efficacy of artemether against toxocariasis in mice: parasitological and immunopathological changes in brain, liver, and lung. Pathog Glob Health 2024; 118:47-64. [PMID: 37978995 PMCID: PMC10769145 DOI: 10.1080/20477724.2023.2285182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023] Open
Abstract
Toxocariasis is a zoonosis that represents a serious threat to public health particularly in tropical and subtropical areas. Currently, albendazole, the most effective drug for treating visceral toxocariasis, shows moderate efficacy against the larvae in tissues and has some adverse effects. Artemether is an antiparasitic drug mainly used in the treatment of malaria and showed effectiveness against numerous helminthic infections. Besides, it possesses potent anti-inflammatory, antiapoptotic, antifibrotic, and neuroprotective properties. Thus, the study's aim was to investigate artemether's effects in comparison with albendazole on the therapeutic outcome of experimental toxocariasis. For this aim, 140 laboratory-bred mice were divided into four main groups: uninfected control, treatment control, albendazole-treated, and artemether-treated groups. The treatment regimens were started at the 15th dpi (early treatment), and at the 35th dpi (late treatment). The effectiveness of treatment was determined by brain larval count, histopathological, immunohistochemical, and biochemical examination. Artemether showed more effectiveness than albendazole in reducing brain larval counts, markers of brain injury including NF-κB, GFAP, and caspase-3, the diameter and number of hepatic granulomas, hepatic oxidative stress, hepatic IL-6, and TG2 mRNA, and pulmonary inflammation and fibrosis. The efficacy of artemether was the same when administered early or late in the infection. Finally, our findings illustrated that artemether might be a promising therapy for T. canis infection and it could be a good substitution for albendazole in toxocariasis treatment.
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Affiliation(s)
- Dina I. Elgendy
- Medical Parasitology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
| | - Rasha A. Elmahy
- Zoology Department, Faculty of Science, Tanta University, Tanta, Egypt
| | | | - Hoda A. Ibrahim
- Medical Biochemistry Department, Faculty of Medicine, Tanta University, Tanta, Egypt
| | - Asmaa Fawzy Eltantawy
- Medical Pharmacology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
| | - Fotouh Rashed Mansour
- Pharmaceutical Analytical Chemistry Department, Faculty of Pharmacy, Tanta University, Tanta, Egypt
| | - Amina M. Salama
- Medical Parasitology Department, Faculty of Medicine, Tanta University, Tanta, Egypt
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Henke K, Ntovas S, Xourgia E, Exadaktylos AK, Klukowska-Rötzler J, Ziaka M. Who Let the Dogs Out? Unmasking the Neglected: A Semi-Systematic Review on the Enduring Impact of Toxocariasis, a Prevalent Zoonotic Infection. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:6972. [PMID: 37947530 PMCID: PMC10649795 DOI: 10.3390/ijerph20216972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/28/2023] [Accepted: 10/17/2023] [Indexed: 11/12/2023]
Abstract
Toxocariasis remains an important neglected parasitic infection representing one of the most common zoonotic infections caused by the parasite Toxocara canis or, less frequently, by Toxocara cati. The epidemiology of the disease is complex due to its transmission route by accidental ingestion of embryonated Toxocara eggs or larvae from tissues from domestic or wild paratenic hosts. Even though the World Health Organization and Centers for Disease Control classified toxocariasis amongst the top six parasitic infections of priority to public health, global epidemiological data regarding the relationship between seropositivity and toxocariasis is limited. Although the vast majority of the infected individuals remain asymptomatic or experience a mild disease, the infection is associated with important health and socioeconomic consequences, particularly in underprivileged, tropical, and subtropical areas. Toxocariasis is a disease with multiple clinical presentations, which are classified into five distinct forms: the classical visceral larva migrans, ocular toxocariasis, common toxocariasis, covert toxocariasis, and cerebral toxocariasis or neurotoxocariasis. Anthelmintic agents, for example, albendazole or mebendazole, are the recommended treatment, whereas a combination with topical or systemic corticosteroids for specific forms is suggested. Prevention strategies include educational programs, behavioral and hygienic changes, enhancement of the role of veterinarians, and anthelmintic regimens to control active infections.
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Affiliation(s)
- Katrin Henke
- Department of Internal Medicine, Thun Hospital, Krankenhausstrasse 12, 3600 Thun, Switzerland;
- Department of Emergency Medicine, Inselspital, University Hospital, University of Bern, 3008 Bern, Switzerland; (S.N.); (A.K.E.); (J.K.-R.)
| | - Sotirios Ntovas
- Department of Emergency Medicine, Inselspital, University Hospital, University of Bern, 3008 Bern, Switzerland; (S.N.); (A.K.E.); (J.K.-R.)
- Department of Visceral Surgery and Medicine, lnselspital, University Hospital, University of Bern, 3008 Bern, Switzerland
| | - Eleni Xourgia
- Department of Heart Surgery, lnselspital, University Hospital, University of Bern, 3008 Bern, Switzerland;
| | - Aristomenis K. Exadaktylos
- Department of Emergency Medicine, Inselspital, University Hospital, University of Bern, 3008 Bern, Switzerland; (S.N.); (A.K.E.); (J.K.-R.)
| | - Jolanta Klukowska-Rötzler
- Department of Emergency Medicine, Inselspital, University Hospital, University of Bern, 3008 Bern, Switzerland; (S.N.); (A.K.E.); (J.K.-R.)
| | - Mairi Ziaka
- Department of Internal Medicine, Thun Hospital, Krankenhausstrasse 12, 3600 Thun, Switzerland;
- Department of Emergency Medicine, Inselspital, University Hospital, University of Bern, 3008 Bern, Switzerland; (S.N.); (A.K.E.); (J.K.-R.)
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Urhan OF, Erol U, Altay K. Molecular detection and phylogenetic analysis of Toxocara vitulorum in feces and milk samples from naturally infected water buffaloes. Res Vet Sci 2023; 162:104952. [PMID: 37473601 DOI: 10.1016/j.rvsc.2023.104952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/23/2023] [Accepted: 07/02/2023] [Indexed: 07/22/2023]
Abstract
Toxocara vitulorum infects cattle and water buffalo, leading to mild to severe infection in calves and has wide geographic distributions, especially in tropical and subtropical countries. This work aimed to assess the prevalence, distributions, and phylogeny of T.vitulorum in water buffaloes in different parts of Sivas, one of the essential buffalo-breeding areas in Türkiye. T.vitulorum was found in 42 (8.23%) and 54 (10.58%) fecal (n:510) samples using microscopic and molecular techniques, respectively. T.vitulorum was higher in animals aged 0-6 months compared to other groups. Furthermore, when animals aged 0-6 months were grouped within themselves, the prevalence of T.vitulorum in 1-3 month-old-animals was higher than in both younger than one month and older than three months. T.vitulorum was detected in fecal samples obtained from animals older than six months. In colostrum/milk samples (n:100), T.vitulorum-larvae were found in 4% and 10% with microscopic and molecular techniques, respectively. The larvae were detected in colostrum/milk samples in the mother between the 2nd and 28th days postpartum-period. The ITS-1-gene of 11 PCR-positive samples was sequenced. The 98.99-100% nucleotide identity was determined between our T.vitulorum isolates and those present in GenBank. In conclusion, this is the first molecular survey and phylogenetic analysis of T.vitulorum in fecal and colostrum/milk samples from naturally infected water buffaloes. Data obtained in this study will help to understand the life cycle and epidemiology of the nematode. Data also revealed that veterinarians should consider older animals as well as young animals in their control program of nematode infections in farms.
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Affiliation(s)
- Osman Furkan Urhan
- Republic of Türkiye Ministry of Agriculture and Forestry, General Directory Meat and Milk Board, Sivas Meat Processing Plant, Sivas 58380, Türkiye
| | - Ufuk Erol
- Department of Parasitology, Faculty of Veterinary Medicine, University of Sivas Cumhuriyet, Sivas 58140, Türkiye
| | - Kursat Altay
- Department of Parasitology, Faculty of Veterinary Medicine, University of Sivas Cumhuriyet, Sivas 58140, Türkiye.
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Soe BK, Su Hlaing K, Naing TW, Thaw ZH, Myint W. The first study on the prevalence of gastrointestinal parasites in owned and sheltered cats in Yangon, Myanmar. Vet World 2023; 16:414-420. [PMID: 37041997 PMCID: PMC10082719 DOI: 10.14202/vetworld.2023.414-420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/18/2023] [Indexed: 03/06/2023] Open
Abstract
Background and Aim: People who used to rear companion animals are healthier than others who do not. Gastrointestinal (GI) helminths are common in cats and serve as reservoirs for zoonotic diseases. However, the prevalence of GI parasites in cats in Myanmar has never been reported. This study aimed to estimate the prevalence of GI parasites in cats in Myanmar and identify the potential risk factors associated with GI parasites.
Materials and Methods: A total of 230 fecal samples were collected from seven veterinary clinics and two shelters within the Yangon region from January to May 2022. Sampled cats were classified according to age, gender, and deworming and rearing practices. Fecal samples were analyzed by fecal wet mount, ethyl acetate centrifugal sedimentation, and zinc sulfate centrifugal flotation techniques. Descriptive data were described, and Pearson's χ2 test was used to identify associated risk factors, such as age, gender, and deworming and rearing practices.
Results: The overall prevalence of GI parasites was 79.56%, and 57.82% of cats were infected with a diagnostic stage of more than one parasite species. Seven GI parasites were detected, including Ancylostoma spp. (55.65%), Toxocara spp. (46.08%), Trichuris spp. (20.86%), Platynosomum spp. (11.73%), Dipylidium caninum (7.39%), Taenia spp. (4.34%), and Cystoisospora spp. (32.17%). Based on statistical analysis, deworming and rearing practices were significantly associated (p < 0.05) with GI parasitic infections.
Conclusion: This study is the first to reveal the prevalence of GI parasites that could assist the need for effective control measures for zoonotic hookworm and roundworm infections in cats. Even with simple microscopic examination, the remarkably high prevalence of GI parasitic infections warrants regular deworming practice. Further molecular studies should also be performed to understand their genetic diversity.
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Affiliation(s)
- Babi Kyi Soe
- Department of Livestock Breeding and Veterinary, Yangon 11021, Myanmar
| | - Khin Su Hlaing
- Department of Livestock Breeding and Veterinary, Yangon 11021, Myanmar
| | - Toe Win Naing
- Livestock Improvement Section, De Heus Myanmar, Yangon 11021, Myanmar
| | - Zin Hnin Thaw
- Department of Livestock Breeding and Veterinary, Yangon 11021, Myanmar
| | - Win Myint
- Pathology Unit, Department of Livestock Breeding and Veterinary, Yangon 11021, Myanmar
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The Complete Mitogenome of Toxocara vitulorum: Novel In-Sights into the Phylogenetics in Toxocaridae. Animals (Basel) 2022; 12:ani12243546. [PMID: 36552470 PMCID: PMC9774135 DOI: 10.3390/ani12243546] [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: 10/11/2022] [Revised: 12/09/2022] [Accepted: 12/13/2022] [Indexed: 12/23/2022] Open
Abstract
Toxocara vitulorum (Ascaridida: Nematoda) is one of the most common intestinal nematodes of cattle and buffalos and, therefore, represents a serious threat to their populations worldwide. Despite its significance in veterinary health the epidemiology, population genetics, and molecular ecology of this nematode remain poorly understood. The mitogenome can yield a foundation for studying these areas and assist in the surveillance and control of T. vitulorum. Herein, the first whole mitogenome of T. vitulorum was sequenced utilizing Illumina technology and characterized with bioinformatic pipeline analyses. The entire genome of T. vitulorum was 15,045 bp in length and contained 12 protein-coding genes (PCGs), 22 transfer RNAs (tRNAs), and two ribosomal RNAs (rRNAs). The gene arrangement (GA) of T. vitulorum was similar to those of other Toxocara species under GA3. The whole genome showed significant levels of AT and GC skew. Comparative mitogenomics including sequence identities, Ka/Ks, and sliding window analysis, indicated a purifying selection of 12 PCGs with cox1 and nad6 having the lowest and highest evolutionary rate, respectively. Whole amino acid sequence-based phylogenetic analysis supported a novel sister-species relationship of T. vitulorum with the congeneric species Toxocara canis, Toxocara cati, and Toxocara malaysiensis in the family Toxocaridae. Further, 12 (PCGs) single gene-based phylogenies suggested that nad4 and nad6 genes shared same topological trees with that of the whole genome, suggesting that these genes were suitable as novel genetic markers for phylogenetic and evolutionary studies of Ascaridida species. This complete mitogenome of T. vitulorum refined phylogenetic relationships in Toxocaridae and provided the resource of markers for population genetics, systematics, and epidemiology of this bovine nematode.
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Mesa-Arango JA, Olave-Velandia AM, García-Montoya GM, Isaza-Agudelo JP, Jiménez-Ruiz A, Alzate JF. Evaluation of new Toxocara canis chimeric antigens as an alternative to conventional TES-Ag for anti- Toxocara antibodies detection. Heliyon 2022; 8:e11144. [PMID: 36299519 PMCID: PMC9589186 DOI: 10.1016/j.heliyon.2022.e11144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 07/01/2022] [Accepted: 10/13/2022] [Indexed: 11/06/2022] Open
Abstract
Human toxocariasis is one of the neglected helminthiases and it is caused by the zoonotic roundworm species Toxocara canis and Toxocara cati. Diagnosis of human toxocariasis is based on the combination of clinical, parasitological, and epidemiological criteria, as well as serology tests that detect anti-Toxocara antibodies. Notwithstanding, due to the absence of pathognomonic symptoms and signs of the disease, serology is the key evidence to support a conclusive diagnosis. TES-ELISA is the most widely used serological test for diagnosis. However, cross-reaction of TES antigens with antibodies produced to other helminth antigens is a major drawback for its application in countries with high parasitic prevalence. T. canis recombinant antigens have been described as an alternative to native TES for diagnosis. Nevertheless, the selection of antigenic proteins is a complex process that requires validation. In this paper, we developed an eGFP carrier-based system to express and purify blocks of recombinant polypeptides of T. canis antigenic proteins. Intense cross-reaction polypeptides were detected by Immunoblot and avoided to finally produce a chimeric prototype protein. Additionally, a control chimeric protein that harbors the complete tested proteins was produced. Purified chimeric antigens were tested in ELISA and Immunoblot assays with 310 sera samples of negative and positive control individuals. Our results showed that chimeric rCHITC0 and rCHITC1 antigens (with sensitivities of 62% 58%, 38% and 16% in IB-rCHITC0, ELISA-rCHITC0, ELISA-rCHITC1 and IB-rCHITC1 respectively for OLMS) can perform better in terms of specificity (being 91%, 89%, 87% and 76% for ELISA-rCHITC1, IB-rCHITC1, ELISA-rCHITC0 and IB-rCHITC0 respectively for OLMS) than T. canis TES-ELISA (with 61% specificity), giving a higher signal with serum samples of infected individuals as well the possibility to discriminate false positive cases with other parasitic infections. Our data suggest that T. canis chimeric proteins, represent candidate antigens for phase II studies.
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Affiliation(s)
- Jairo A. Mesa-Arango
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Ana M. Olave-Velandia
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Gisela M. García-Montoya
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Juan P. Isaza-Agudelo
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia
| | - Antonio Jiménez-Ruiz
- Departamento de Biología de Sistemas, Universidad de Alcalá, Alcalá de Henares, Madrid, Spain
| | - Juan F. Alzate
- Centro Nacional de Secuenciación Genómica-CNSG, Sede de Investigación Universitaria-SIU, Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Grupo de Parasitología, Facultad de Medicina, Universidad de Antioquia, Colombia,Corresponding author.
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Borchard JL, Conrad NL, Pinto NB, Moura MQD, Berne MEA, Leite FPL. Acute and chronic immunomodulatory response mechanisms against Toxocara canis larvae infection in mice. REVISTA BRASILEIRA DE PARASITOLOGIA VETERINÁRIA 2022. [DOI: 10.1590/s1984-29612022056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract The objective of this work was to evaluate the early and late immunological modulation of an experimental infection of T. canis larvae in mice. Mice were infected with 100 infective larvae and euthanized at different period: 24, 48 hours post infection (HPI), 15- and 30 days post infection (DPI). The humoral response was evaluated by indirect ELISA. Quantitative RT–PCR (qPCR) was used to quantify the mRNA transcription of cytokines IL4, IL10, IL12 and Ym1 in the early and late infection periods. Infection with T. canis was able to generate specific total IgG at 15- and 30- DPI. Analyzing the IgG isotype revealed a significant differentiation for IgG1 compared with IgG2a, IgG2b and IgG3, characterizing a Th-2 response. Evaluating the gene transcription at the early phase of infection, higher transcription levels of IL10, IL4 and Ym1 and a downregulation of IL12 were observed. By the late phase, increased transcription levels of IL4, Ym1 and IL12 were observed, and downregulation of IL-10 transcription was observed. The data obtained suggest that during experimental infection with T. canis, the participation of the IL4, IL10, IL12 cytokines and Ym1 can play an important role in T. canis immunomodulation.
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Cháves-González LE, Morales-Calvo F, Mora J, Solano-Barquero A, Verocai GG, Rojas A. What lies behind the curtain: Cryptic diversity in helminth parasites of human and veterinary importance. CURRENT RESEARCH IN PARASITOLOGY & VECTOR-BORNE DISEASES 2022; 2:100094. [PMID: 35800064 PMCID: PMC9253710 DOI: 10.1016/j.crpvbd.2022.100094] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/28/2022] [Accepted: 06/07/2022] [Indexed: 11/17/2022]
Abstract
Parasite cryptic species are morphologically indistinguishable but genetically distinct organisms, leading to taxa with unclear species boundaries. Speciation mechanisms such as cospeciation, host colonization, taxon pulse, and oscillation may lead to the emergence of cryptic species, influencing host-parasite interactions, parasite ecology, distribution, and biodiversity. The study of cryptic species diversity in helminth parasites of human and veterinary importance has gained relevance, since their distribution may affect clinical and epidemiological features such as pathogenicity, virulence, drug resistance and susceptibility, mortality, and morbidity, ultimately affecting patient management, course, and outcome of treatment. At the same time, the need for recognition of cryptic species diversity has implied a transition from morphological to molecular diagnostic methods, which are becoming more available and accessible in parasitology. Here, we discuss the general approaches for cryptic species delineation and summarize some examples found in nematodes, trematodes and cestodes of medical and veterinary importance, along with the clinical implications of their taxonomic status. Lastly, we highlight the need for the correct interpretation of molecular information, and the correct use of definitions when reporting or describing new cryptic species in parasitology, since molecular and morphological data should be integrated whenever possible. Cryptic diversity has been described in helminths of human and animal importance. Cryptic species are morphologically indistinguishable but genetically distinct organisms. These entities emerge by different evolutionary and speciation mechanisms. Analysis of molecular and morphological data is needed for cryptic species delimitation. Cryptic diversity may affect pathogenicity, virulence and drug resistance of helminths.
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Affiliation(s)
- Luis Enrique Cháves-González
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Fernando Morales-Calvo
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Javier Mora
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Alberto Solano-Barquero
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Guilherme G. Verocai
- Department of Veterinary Pathobiology, Texas A&M University, College of Veterinary Medicine and Biomedical Sciences, College Station, TX, USA
| | - Alicia Rojas
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
- Corresponding author. Twitter icon
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Jarosz W, Durant JF, Irenge LMWB, Fogt-Wyrwas R, Mizgajska-Wiktor H, Gala JL. Optimized DNA-based identification of Toxocara spp. eggs in soil and sand samples. Parasit Vectors 2021; 14:426. [PMID: 34446077 PMCID: PMC8390219 DOI: 10.1186/s13071-021-04904-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2021] [Accepted: 07/29/2021] [Indexed: 11/22/2022] Open
Abstract
Background Toxocara canis and Toxocara cati are globally distributed roundworms and causative agents of human toxocariasis, via ingestion of Toxocara eggs. Control of Toxocara infections is constrained by a lack of sensitive methods for screening of animal faeces and environmental samples potentially contaminated by Toxocara eggs. In this work, a pre-analytical method for efficient extraction of DNA from Toxocara eggs in environmental samples was set up using our previously validated T. canis- and T. cati-specific quantitative real-time polymerase chain reaction (qPCR). For this purpose, the influence of different methods for egg lysis, DNA extraction and purification for removal of PCR inhibitors were assessed on environmental samples. Methods To select the best egg disruption method, six protocols were compared on pure T. canis egg suspensions, including enzymatic lysis and thermal or mechanical disruption. Based on the selected best method, an analytical workflow was set up to compare two DNA extraction methods (FastDNA™ SPIN Kit for Soil versus DNeasy® PowerMax® Soil Kit) with an optional dilution and/or clean-up (Agencourt® AMPure®) step. This workflow was evaluated on 10-g soil and 10-g sand samples spiked with egg suspensions of T. canis (tenfold dilutions of 104 eggs in triplicate). The capacity of the different methods, used alone or in combination, to increase the ratio of positive tests was assessed. The resulting optimal workflow for processing spiked soil samples was then tested on environmental soil samples and compared with the conventional flotation-centrifugation and microscopic examination of Toxocara eggs. Results The most effective DNA extraction method for Toxocara eggs in soil samples consisted in the combination of mechanical lysis of eggs using beads, followed by DNA extraction with the DNeasy® PowerMax® Soil Kit, and completed with an additional DNA clean-up step with AMPure® beads and a sample DNA dilution (1:10). This workflow exhibited a limit of detection of 4 and 46 T.canis eggs in 10-g sand and 10-g soil samples, respectively. Conclusions The pre-analytical flow process developed here combined with qPCR represents an improved, potentially automatable, and cost-effective method for the surveillance of Toxocara contamination in the environment. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04904-1.
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Affiliation(s)
- Wojciech Jarosz
- Department of Biology and Anatomy, Faculty of Health Sciences, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871, Poznan, Poland
| | - Jean-Francois Durant
- Center for Applied Molecular Technologies, Institute of Clinical and Experimental Research, Université Catholique de Louvain, Tour Claude Bernard, Avenue Hippocrate 54-55, 1st Floor, B1.54.01, 1200, Brussels, Belgium
| | - Leonid Mwana Wa Bene Irenge
- Center for Applied Molecular Technologies, Institute of Clinical and Experimental Research, Université Catholique de Louvain, Tour Claude Bernard, Avenue Hippocrate 54-55, 1st Floor, B1.54.01, 1200, Brussels, Belgium.,Defense Laboratories Department, ACOS Ops & Trg, Belgian Armed Forces, Martelarenstraat, 181, 1800, Peutie, Belgium
| | - Renata Fogt-Wyrwas
- Department of Biology and Anatomy, Faculty of Health Sciences, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871, Poznan, Poland
| | - Hanna Mizgajska-Wiktor
- Department of Biology and Anatomy, Faculty of Health Sciences, Poznań University of Physical Education, Królowej Jadwigi 27/39, 61-871, Poznan, Poland
| | - Jean-Luc Gala
- Center for Applied Molecular Technologies, Institute of Clinical and Experimental Research, Université Catholique de Louvain, Tour Claude Bernard, Avenue Hippocrate 54-55, 1st Floor, B1.54.01, 1200, Brussels, Belgium.
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13
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Li H, Liu Y, Wang C, Li Y, Chen Y, Wang L, Zhou X, Xie Y. The complete mitogenome of Toxascaris leonina from the Siberian tiger ( Panthera tigris altaica). MITOCHONDRIAL DNA PART B-RESOURCES 2021; 6:1416-1418. [PMID: 33948494 PMCID: PMC8057085 DOI: 10.1080/23802359.2021.1911713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Toxascaris leonina is a polyxenical parasite and commonly found in canids and felids. In this study, we used the Illumina high throughput sequencing and assembly to determine the complete mitogenome of a representative of this parasite from the Siberian tiger (Panthera tigris altaica). The genome was 14,248 bp in size and encoded 12 protein-coding genes, 22 transfer RNAs, and two ribosomal RNAs. Phylogeny showed that two canid (dog)-originated T. leonina were phylogenetically distinct from two felid-originated T. leonina (tiger isolate and cheetah isolate), suggesting at least two distinct subclades of T. leonina infecting these hosts and supporting once again that T. leonina represents a species complex. Furthermore, four isolates of T. leonina grouped together and were more closely related to other species from the family Ascarididae than species of families Toxocaridae, Anisakidae and Ascaridiidae, demonstrating phylogenetic stability of these paraphyletic groups characterized in this study. These cumulative mitochondrial DNA data provide a better understanding of phylogenetic relationships of this polyxenical and zoonotic roundworm species.
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Affiliation(s)
- Hongyu Li
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Yunjian Liu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Chengdong Wang
- China Conservation and Research Center for Giant Panda, Wolong, China
| | - Yingxin Li
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Yijun Chen
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Lidan Wang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
| | - Xuan Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, China
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Zou Y, Zheng WB, He JJ, Elsheikha HM, Zhu XQ, Lu YX. Toxocara canis Differentially Affects Hepatic MicroRNA Expression in Beagle Dogs at Different Stages of Infection. Front Vet Sci 2020; 7:587273. [PMID: 33282932 PMCID: PMC7689213 DOI: 10.3389/fvets.2020.587273] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Accepted: 10/01/2020] [Indexed: 01/25/2023] Open
Abstract
Toxocara canis is a neglected zoonotic parasite, which threatens the health of dogs and humans worldwide. The molecular mechanisms that underlie the progression of T. canis infection remain mostly unknown. MicroRNAs (miRNAs) are small non-coding RNAs that have been identified in T. canis; however, the regulation and role of miRNAs in the host during infection remain incompletely understood. In this study, we determined hepatic miRNA expression at different stages of T. canis infection in beagle dogs. Individual dogs were infected by 300 embryonated T. canis eggs, and their livers were collected at 12 hpi (hours post-infection), 24 hpi, and 36 dpi (days post-infection). The expression profiles of liver miRNAs were determined using RNA-sequencing. Compared to the control groups, 9, 16, and 34 differentially expressed miRNAs (DEmiRNAs) were detected in the livers of infected dogs at the three infection stages, respectively. Among those DEmiRNAs, the novel-294 and cfa-miR-885 were predicted to regulate inflammation-related genes at the initial stage of infection (12 hpi). The cfa-miR-1839 was predicted to regulate the target gene TRIM71, which may influence the development of T. canis larvae at 24 hpi. Moreover, cfa-miR-370 and cfa-miR-133c were associated with immune response at the final stage of infection (36 dpi). Some immunity-related Gene Ontology terms were enriched particularly at 24 hpi. Likewise, Kyoto Encyclopedia of Genes and Genomes pathway analysis showed that many significantly enriched pathways were involved in inflammation and immune responses. The expression level of nine DEmiRNAs was validated using quantitative real-time PCR (qRT-PCR). These results show that miRNAs play critical roles in the pathogenesis of T. canis during the hepatic phase of parasite development. Our data provide fundamental information for further investigation of the roles of miRNAs in the innate/adaptive immune response of dogs infected by T. canis.
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Affiliation(s)
- Yang Zou
- Heilongjiang Key Laboratory for Zoonosis, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
| | - Wen-Bin Zheng
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jun-Jun He
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Hany M Elsheikha
- Faculty of Medicine and Health Sciences, School of Veterinary Medicine and Science, University of Nottingham, Loughborough, United Kingdom
| | - Xing-Quan Zhu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.,College of Veterinary Medicine, Shanxi Agricultural University, Taigu, China
| | - Yi-Xin Lu
- Heilongjiang Key Laboratory for Zoonosis, College of Veterinary Medicine, Northeast Agricultural University, Harbin, China
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Kim HC, Hong EJ, Ryu SY, Park J, Cho JG, Yu DH, Chae JS, Choi KS, Park BK. Morphological and Molecular Characterization of Toxocara apodemi (Nematoda: Ascarididae) from Striped Field Mice, Apodemus agrarius, in Korea. THE KOREAN JOURNAL OF PARASITOLOGY 2020; 58:403-411. [PMID: 32871634 PMCID: PMC7462795 DOI: 10.3347/kjp.2020.58.4.403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Accepted: 07/27/2020] [Indexed: 11/26/2022]
Abstract
Adult ascarid worms from the field mice, Apodemus agrarius, were observed with a light and scanning electron microscope, and molecularly analized with 18S rRNA gene. In the scanning electron microscope, 3 prominent labia were present in the anterior end of male and female worms, but the interlabia and gubernaculum were absent. Scanning electron micrographs showed cervical alae as vestigial organs that looked like a slightly uplifted superficial sewing stitch. Total 6 pairs of post-cloacal papillae were observed on the tail of the male worms. The tail of female worms was blunt and conical shape with a spine-like structure, mucron. The eggs were sub-globular, coated with the albuminous layer and 73 by 82 μm in average size. The superficial pits of T. apodemi egg (mean 8.6×6.7 μm) are obviously bigger than those of Toxocara spp. The partial sequence of 18S rRNA showed the sequence homology of Toxocara canis (99.6%), Toxocara cati (99.4%), Toxascaris leonina (99.4%), and Toxocara vitulorum (99.2%). Conclusively, it was confirmed that ascarid nematodes, Toxocara apodemi, recovered from striped field mice in Korea are taxonomically conspecific relationship with genus Toxocara and genetic divergence from other Toxocara species.
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Affiliation(s)
- Hyeon Cheol Kim
- College of Veterinary Medicine and Institute of Veterinary Science, Kangwon National University, Chuncheon 24289, Korea
| | - Eui Ju Hong
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Si Yun Ryu
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Jinho Park
- College of Veterinary Medicine, Chonbuk National University, Iksan 54596, Korea
| | - Jeong Gon Cho
- College of Veterinary Medicine, Chonbuk National University, Iksan 54596, Korea
| | - Do Hyeon Yu
- College of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea
| | - Joon Seok Chae
- Laboratory of Veterinary Internal Medicine, BK21 PLUS Program for Creative Veterinary Science Research, Research Institute for Veterinary Science and College of Veterinary Medicine, Seoul National University, Seoul 08826, Korea
| | - Kyoung Seong Choi
- College of Ecology and Environmental Science, Kyungpook National University, Sangju 37224, Korea
| | - Bae Keun Park
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
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Xie Y, Li Y, Gu X, Liu Y, Zhou X, Wang L, He R, Peng X, Yang G. Molecular characterization of ascaridoid parasites from captive wild carnivores in China using ribosomal and mitochondrial sequences. Parasit Vectors 2020; 13:382. [PMID: 32727607 PMCID: PMC7391581 DOI: 10.1186/s13071-020-04254-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 07/21/2020] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND Despite the public health importance of toxocariasis/toxascariasis, only a few species of these ascaridoid parasites from wild canine and feline carnivores have been studied at the molecular level so far. Poor understanding of diversity, host distribution and the potential (zoonotic) transmission of the ascaridoid species among wild animals negatively affects their surveillance and control in natural settings. In this study, we updated previous knowledge by profiling the genetic diversity and phylogenetic relationships of ascaridoid species among eleven wild canine and feline animals on the basis of a combined analysis of the ribosomal internal transcribed spacer region (ITS) gene and the partial mitochondrial cytochrome c oxidase subunit 2 (cox2) and NADH dehydrogenase subunit 1 (nad1) genes. RESULTS In total, three genetically distinct ascaridoid lineages were determined to be present among these wild carnivores sampled, including Toxocara canis in Alopex lagopus and Vulpes vulpes, Toxocara cati in Felis chaus, Prionailurus bengalensis and Catopuma temmincki and Toxascaris leonina in Canis lupus, Panthera tigris altaica, Panthera tigris amoyensis, Panthera tigris tigris, Panthera leo and Lynx lynx. Furthermore, it was evident that T. leonina lineage split into three well-supported subclades depending on their host species, i.e. wild felids, dogs and wolves and foxes, based on integrated genetic and phylogenetic evidence, supporting that a complex of T. leonina other than one species infecting these hosts. CONCLUSIONS These results provide new molecular insights into classification, phylogenetic relationships and epidemiological importance of ascaridoids from wild canids and felids and also highlight the complex of the taxonomy and genetics of Toxascaris in their wild and domestic carnivorous hosts.
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Affiliation(s)
- Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China.
| | - Yingxin Li
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Xiaobin Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Yunjian Liu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Xuan Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, 611130, China
| | - Lu Wang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Ran He
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China
| | - Xuerong Peng
- Department of Chemistry, College of Life and Basic Science, Sichuan Agricultural University, Chengdu, 611130, China
| | - Guangyou Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, China.
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Molecular Characterization and Phylogenetic Analysis of Toxocara Species in Dogs, Cattle and Buffalo in Egypt. Helminthologia 2020; 57:83-90. [PMID: 32518484 PMCID: PMC7261022 DOI: 10.2478/helm-2020-0013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2019] [Accepted: 12/21/2019] [Indexed: 11/21/2022] Open
Abstract
Toxocara canis of dogs and Toxocara vitulorum of cattle and buffalo are nematode parasites that cause serious economic and public health problems all over the world. This study aims to provide molecular data to identify and distinguish between Toxocara spp. from dogs, cattle and buffalo in Egypt. Moreover, constructing a phylogeny and phylogenetic relationships among these Toxocara spp. were performed through an analytic study of ATPase-6, a mitochondrial gene; 12S, small subunit ribosomal RNA gene and ITS-2, the second internal transcribed spacer nuclear ribosomal gene. T. vitulorum from cattle and buffalo were found to be almost identical. The ATPase- 6 and 12S regions showed 87.78 % and 90.38 % nucleotide similarity between T. canis and T. vitulorum, while for the ITS-2 region, only 78.38 % was found. Analysis of the three studied genes revealed that each Toxocara spp. has distinct molecular characteristics. Moreover, it was revealed that these genes, especially the ITS-2 gene, are useful and sensitive molecular markers for classifying and studying the phylogenetic analysis and relationships among closely related Toxocara spp. All sequences obtained in this study were registered in the GenBank under the accession numbers: MG214149 -MG214157.
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Noordin R, Yunus MH, Tan Farrizam SN, Arifin N. Serodiagnostic methods for diagnosing larval toxocariasis. ADVANCES IN PARASITOLOGY 2020; 109:131-152. [PMID: 32381194 DOI: 10.1016/bs.apar.2020.01.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Toxocariasis is a human infection primarily caused by larvae of Toxocara canis from dogs, and also by T. cati from cats. Children have a more significant risk of acquiring the infection due to their closer contact with pets, and greater chances of ingesting soil. Diagnosis of toxocariasis is based on clinical, epidemiological, and serological data. Indirect IgG ELISA is a widely used serodiagnostic method for toxocariasis, with native T. canis TES most commonly used as the antigen. Western blots, using the same antigen, can be used to confirm positive ELISA findings to reduce false-positive results. Improvements in Toxocara serodiagnosis include the use of recombinant TES antigens, simpler and more rapid assay formats, and IgG4 subclass detection. Also, incorporation of recombinant T. cati TES protein increases the diagnostic sensitivity. Development of antigen detection tests using polyclonal and monoclonal antibodies, nanobodies, or aptamers can complement the antibody detection assays, and enhance the effectiveness of the serodiagnosis.
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Affiliation(s)
- Rahmah Noordin
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia.
| | - Muhammad Hafiznur Yunus
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia
| | - Siti Naqiuyah Tan Farrizam
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia
| | - Norsyahida Arifin
- Institute for Research in Molecular Medicine, Universiti Sains Malaysia, Gelugor, Pulau Pinang, Malaysia
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19
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Mazur-Melewska K, Mania A, Sluzewski W, Figlerowicz M. Clinical pathology of larval toxocariasis. ADVANCES IN PARASITOLOGY 2020; 109:153-163. [PMID: 32381195 DOI: 10.1016/bs.apar.2020.01.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Human toxocariasis is a worldwide helminth zoonosis caused by roundworms of the genus Toxocara. Toxocariasis is the most common helminth infection in many countries. Disease caused by Toxocara can be classified into five clinical forms: generalised, neurological, ocular, covert, and asymptomatic. The clinical pathology of toxocariasis largely depends on the form of infection, the intensity of the infection, the larvae localisation, and the age of the host. Because histological and molecular examination of toxocariasis is limited by difficulties in obtaining material to analyse, clinical diagnosis is often based on nonspecific tests, such as the detection of eosinophilia and hyperimmunoglobulinemia E (Hyper-IgE). Specific analysis uses an initial ELISA test to detect anti-Toxocara IgG and requires confirmation for all positive results via Western blot. This strategy does not distinguish between actual and recent infections, making the monitoring of disease a challenge for clinicians. Additional research will be required to distinguish active disease from the presence of recent infection.
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Affiliation(s)
- Katarzyna Mazur-Melewska
- Department of Infectious Diseases and Child Neurology, Karol Marcinkowski University of Medical Sciences, Poznań, Poland.
| | - Anna Mania
- Department of Infectious Diseases and Child Neurology, Karol Marcinkowski University of Medical Sciences, Poznań, Poland
| | - Wojciech Sluzewski
- Department of Infectious Diseases and Child Neurology, Karol Marcinkowski University of Medical Sciences, Poznań, Poland
| | - Magdalena Figlerowicz
- Department of Infectious Diseases and Child Neurology, Karol Marcinkowski University of Medical Sciences, Poznań, Poland
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Vidaña B, Floyd T, Brena C, Lyle R, Carson A, Hamilton CM, Wessels M. First Case of Idiopathic Eosinophilic Meningoencephalitis in a Sheep. J Comp Pathol 2019; 174:58-62. [PMID: 31955804 DOI: 10.1016/j.jcpa.2019.10.194] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/22/2019] [Accepted: 10/30/2019] [Indexed: 11/18/2022]
Abstract
A 1.5-year-old ewe was presented with neurological signs that had been observed from about 2 days prior to death. There had been no clinical response to anti-inflammatory and antibiotic treatment. Histopathological examination of the brain revealed a severe and widespread eosinophilic meningoencephalomyelitis of unknown aetiology. Defining histological features included diffuse angiocentric eosinophilic infiltrates in the neuroparenchyma and meninges, neuronal necrosis, astrocytosis, neuropil vacuolation and occasional glial scars. Differential diagnostics for eosinophilic meningoencephalitis were taken into account and investigated by means of special stains, immunohistochemistry, bacteriology and polymerase chain reaction. No pathological changes or ancillary tests were supportive or revealed a specific aetiology for the condition and therefore it was considered idiopathic. Idiopathic meningoencephalitis is a rare disease, mainly described in man and rarely in dogs, with no apparent aetiological cause or potential breed predisposition. To our knowledge this is the first case of idiopathic eosinophilic meningoencephalitis in a sheep and provides a histopathological guideline for prospective comparative pathology studies.
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Affiliation(s)
- B Vidaña
- Pathology Department, Animal and Plant Health Agency (APHA)-Weybridge, Addlestone, UK.
| | - T Floyd
- Pathology Department, Animal and Plant Health Agency (APHA)-Weybridge, Addlestone, UK
| | - C Brena
- Surveillance and Laboratory Services, APHA-Thirsk Veterinary Investigation Centre, West House, Station Road, Thirsk, UK
| | - R Lyle
- Bishopton Veterinary Group, Mill Farm, Studley Road, Ripon, UK
| | - A Carson
- Surveillance Intelligence Unit, APHA-Penrith Veterinary Investigation Centre, Merrythought Calthwaite, UK
| | - C M Hamilton
- Moredun Research Institute, Pentlands Science Park, Bush Loan, UK
| | - M Wessels
- Finn Pathologists, One Eyed Lane, Weybread, Diss, UK
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Xie Y, Li H, Wang C, Li Y, Liu Y, Meng X, Wang L, Zhou X, Zheng Y, Zuo Z, Gu X, Yang G. Characterization of the complete mitochondrial genome sequence of the dog roundworm Toxascaris leonina (Nematoda, Ascarididae) from China. Mitochondrial DNA B Resour 2019; 4:3517-3519. [PMID: 33366066 PMCID: PMC7707352 DOI: 10.1080/23802359.2019.1675545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 09/25/2019] [Indexed: 11/24/2022] Open
Abstract
Toxascaris leonina (Nematoda, Ascarididae) is a cosmopolitan nematode of canids and felids and poses potential threats to public health due to aberrant larva migrans. Herein, the complete mitochondrial genome sequence of a representative of this nematode from the dog in China was determined using next-generation sequencing technology. The assembled genome was 14,357 bp in length and encoded 36 genes, including 12 protein-coding genes, 22 transfer RNAs and 2 ribosomal RNAs. The phylogeny revealed that the canid-originated T. leonina were phylogenetic distinctiveness from the felid-originated T. leonina within the genus Toxascaris of Ascarididae, supporting that T. leonina may represent a species complex.
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Affiliation(s)
- Yue Xie
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Hongyu Li
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Chengdong Wang
- China Conservation and Research Center for Giant Panda, Wolong, Sichuan, China
| | - Yingxin Li
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yunjian Liu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xiaduo Meng
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Lu Wang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xuan Zhou
- Institute of Animal Genetics and Breeding, College of Animal Science and Technology, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Youle Zheng
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Zhicai Zuo
- Key Laboratory of Animal Disease and Human Health of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xiaobin Gu
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Guangyou Yang
- Department of Parasitology, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
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Rostami A, Ma G, Wang T, Koehler AV, Hofmann A, Chang BCH, Macpherson CN, Gasser RB. Human toxocariasis - A look at a neglected disease through an epidemiological 'prism'. INFECTION GENETICS AND EVOLUTION 2019; 74:104002. [PMID: 31412276 DOI: 10.1016/j.meegid.2019.104002] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2019] [Revised: 08/07/2019] [Accepted: 08/09/2019] [Indexed: 01/01/2023]
Abstract
Toxocariasis, a disease caused by infection with larvae of Toxocara canis, T. cati and/or congeners, represents clinical syndromes in humans including visceral and ocular larva migrans, neurotoxocariasis and covert/common toxocariasis. It is reported to be one of the most widespread public health and economically important zoonotic parasitic infections that humans share with dogs, wild canids, including foxes, and possibly other mammals. Humans become infected by accidental ingestion of embryonated Toxocara eggs, or larvae from tissues from domestic or wild paratenic hosts. Most infections are asymptomatic, and human disease may go unnoticed, as clinical investigation is often not pursued and/or diagnostic testing not conducted. Sometimes toxocariasis can be associated with complications, such as allergic and/or neurological disorders, possibly including cognitive or developmental delays in children. There is no anti-toxocariasis vaccine, and chemotherapy in humans varies, depending on symptoms and location of larvae, and may include the administration of albendazole or mebendazole, together with anti-inflammatory corticosteroids. Some recent studies indicate that toxocariasis is having an increased, adverse impact on human health in some, particularly underprivileged, tropical and subtropical communities around the world. Although tens of millions of people, especially children, are expected to be exposed to, or infected with Toxocara species, there is limited precise epidemiological data or information on the relationship between seropositivity and disease (toxocariasis) on a global scale. To gain an improved insight into this area, the present article reviews salient clinical aspects of human toxocariasis and the epidemiology of this disease, with particular reference to seroprevalence, and discusses future research and approaches/measures to understand and prevent/control this socioeconomically important, yet neglected zoonosis.
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Affiliation(s)
- Ali Rostami
- Infectious Diseases and Tropical Medicine Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran
| | - Guangxu Ma
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Tao Wang
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Anson V Koehler
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Andreas Hofmann
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Bill C H Chang
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia
| | - Calum N Macpherson
- School of Graduate Studies, St. George's University, Grenada; School of Veterinary Medicine, St. George's University, Grenada; Windward Islands Research and Education Foundation, Grenada
| | - Robin B Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria, Australia.
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Moura MQD, Macedo MRPD, Terto WDDS, Avila LFDC, Leivas Leite FP, Scaini CJ, Pinto NB, Capella GDA, Strothmann AL, Villela MM, Berne MEA. Detection of Toxocara canis DNA in tissues of experimentally infected mice. Acta Trop 2018; 187:51-56. [PMID: 30053384 DOI: 10.1016/j.actatropica.2018.07.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2018] [Revised: 07/12/2018] [Accepted: 07/23/2018] [Indexed: 01/20/2023]
Abstract
The main etiological agent of toxocariasis is the helminth Toxocara canis. Several difficulties are found in the diagnosis of this disease, because of nonspecific clinical signs and possible cross-reactions that may occur in the available test, the indirect ELISA. Therefore, molecular diagnosis has been indicated as an alternative to conventional diagnosis. The purpose of this study was to evaluate the polymerase chain reaction (PCR) technique for the identification of T. canis in tissues of experimentally infected mice. To this end, nine mice were inoculated with 1500 embryonated eggs and were divided into two groups, the first euthanized 48 h (G1) and the other 30 days post inoculation (G2). Lungs, brain, liver and blood were collected from all the animals for DNA Extraction and tissue digestion, also was collected blood samples for DNA extraction and ELISA test (serum). Toxocara canis DNA was identified in all the inoculated animals using the ITS-2 target gene. The PCR test successfully identified the parasite in the brain, lung and liver of the animals euthanized 48 h PI and 30 days PI. This technique yielded good results in the identification of the parasite in the brain, being more sensitive than the method for the recovery of larvae, in the group with acute infection (48 h PI). The infection was confirmed by PCR within 48 h after infection, while the ELISA indicated serological conversion occurred only 14 days after inoculation. This study demonstrates the ability of PCR to identify T. canis in the liver, lungs and brain during acute and chronic infection.
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Toxocariasis: a silent threat with a progressive public health impact. Infect Dis Poverty 2018; 7:59. [PMID: 29895324 PMCID: PMC5998503 DOI: 10.1186/s40249-018-0437-0] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 05/09/2018] [Indexed: 11/10/2022] Open
Abstract
Background Toxocariasis is a neglected parasitic zoonosis that afflicts millions of the pediatric and adolescent populations worldwide, especially in impoverished communities. This disease is caused by infection with the larvae of Toxocara canis and T. cati, the most ubiquitous intestinal nematode parasite in dogs and cats, respectively. In this article, recent advances in the epidemiology, clinical presentation, diagnosis and pharmacotherapies that have been used in the treatment of toxocariasis are reviewed. Main text Over the past two decades, we have come far in our understanding of the biology and epidemiology of toxocariasis. However, lack of laboratory infrastructure in some countries, lack of uniform case definitions and limited surveillance infrastructure are some of the challenges that hindered the estimation of global disease burden. Toxocariasis encompasses four clinical forms: visceral, ocular, covert and neural. Incorrect or misdiagnosis of any of these disabling conditions can result in severe health consequences and considerable medical care spending. Fortunately, multiple diagnostic modalities are available, which if effectively used together with the administration of appropriate pharmacologic therapies, can minimize any unnecessary patient morbidity. Conclusions Although progress has been made in the management of toxocariasis patients, there remains much work to be done. Implementation of new technologies and better understanding of the pathogenesis of toxocariasis can identify new diagnostic biomarkers, which may help in increasing diagnostic accuracy. Also, further clinical research breakthroughs are needed to develop better ways to effectively control and prevent this serious disease. Electronic supplementary material The online version of this article (10.1186/s40249-018-0437-0) contains supplementary material, which is available to authorized users.
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[Zoonotic intestinal nematodes in dogs from public parks in Yucatán, México]. BIOMEDICA 2018; 38:105-110. [PMID: 29668139 DOI: 10.7705/biomedica.v38i0.3595] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 01/19/2017] [Indexed: 11/21/2022]
Abstract
INTRODUCTION Dogs represent a potential public health risk because of the natural transmission of zoonotic parasitic infections. OBJECTIVE To estimate the frequency and to determine factors associated with the presence of intestinal nematode eggs in dog feces collected in public parks of Mérida,Yucatán, México. MATERIALS AND METHODS A total of 100 dog fecal samples collected from 20 public parks in two areas of Mérida were analyzed. Samples were processed by the centrifugation-flotation and the McMaster techniques to confirm the presence and to quantify the excretion of intestinal nematode eggs per gram of feces. The factors associated with the presence of nematode eggs were identified using the chi square univariate analysis. RESULTS We found an 11% frequency of fecal samples positive for intestinal nematode eggs. Eggs of three species of parasites were identified: Ancylostoma caninum was the most common (10%), followed by Toxocara canis (10%), and Trichuris vulpis (1%). Most positive samples were infected with only one intestinal nematode (10%), and only 1 % was positive for a mixed infection by A. caninum and T. vulpis. The presence of stray dogs in public parks was an associated factor (p=0.046) with a higher number of fecal samples positive for intestinal nematode eggs. CONCLUSIONS The frequency of intestinal nematodes in dog feces with zoonotic potential was high in parks of Mérida, Yucatán, México; samples from parks where there were stray dogs had a higher possibility of being positive.
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Ben-Shoshan M, Grattan CE. Management of Pediatric Urticaria with Review of the Literature on Chronic Spontaneous Urticaria in Children. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2018; 6:1152-1161. [PMID: 29550102 DOI: 10.1016/j.jaip.2018.02.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 02/05/2018] [Accepted: 02/16/2018] [Indexed: 12/26/2022]
Abstract
There are substantial knowledge gaps related to diagnosis and management of pediatric cases of chronic urticaria, and in particular chronic spontaneous urticaria (CSU). In this article we aimed to review the diagnosis and management of chronic urticaria in children and CSU in particular. We conducted a systematic review of articles published in English and French on pediatric CSU management in the last 10 years. We included experimental studies (eg, randomized controlled trials), other experimental designs (eg, nonrandomized methods of assignment, controlled before-after studies, and interrupted time series), and observational studies (eg, prospective or retrospective cohort studies, cross-sectional studies, case-control studies, and case reports). Our findings highlight the efficacy of second-generation antihistamines for the treatment of CSU in children and supports the use of omalizumab for more severe cases. However, our study also reveals severe knowledge gaps related to the best management strategy in children with more severe/refractory cases of CSU. Future studies are required to establish the beneficial effect of high doses of second-generation antihistamines as well as the effectiveness and safety of omalizumab and other biologics in young children.
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Affiliation(s)
- Moshe Ben-Shoshan
- Division of Allergy Immunology and Dermatology, Montreal Children's Hospital, Montreal, Quebec, Canada.
| | - Clive E Grattan
- St John's Institute of Dermatology, Guy's Hospital, London, United Kingdom
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Veterinary parasitology teaching in China in the 21st century – Challenges, opportunities and perspectives. Vet Parasitol 2018; 252:70-73. [DOI: 10.1016/j.vetpar.2018.01.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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28
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Toxocariasis in Carnivora from Argentinean Patagonia: Species molecular identification, hosts, and geographical distribution. INTERNATIONAL JOURNAL FOR PARASITOLOGY-PARASITES AND WILDLIFE 2018; 7:106-110. [PMID: 29988800 PMCID: PMC6032027 DOI: 10.1016/j.ijppaw.2018.02.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/20/2018] [Accepted: 02/24/2018] [Indexed: 11/25/2022]
Abstract
Twenty four specimens of seven species belonging to the families Felidae, Mustelidae, and Canidae were obtained in Lanín and Nahuel Huapi National Parks from March 1996 to April 2016. Specimens were processed by necropsy in order to contribute to the knowledge of toxocariasis in wild carnivores of Argentinean Patagonia. The only Puma concolor and the seven Leopardus geoffroyi were positive for Toxocara cati. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) of the ITS-1 region from larval and adult DNA was carried out to confirm parasite species identification. This is the first molecular determination of T. cati from wild felids in Argentina and the study also fill gaps about the spatial distribution and hosts for Toxocara cati. Puma concolor and Leopardus geoffroyi were positive for Toxocara cati in Patagonia. Other five species of carnivores (Mustelidae and Canidae) were negative for T. cati. The species identity of ascarid specimens were confirmed by PCR-RFLP procedure. This is the first record of toxocariasis in wild Carnivora from Río Negro province. These are the southernmost record of T. cati. in South America for L. geoffroyi.
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Mikaeili F, Mathis A, Deplazes P, Mirhendi H, Barazesh A, Ebrahimi S, Kia EB. Differentiation of Toxocara canis and Toxocara cati based on PCR-RFLP analyses of rDNA-ITS and mitochondrial cox1 and nad1 regions. Acta Parasitol 2017; 62:549-556. [PMID: 28682773 DOI: 10.1515/ap-2017-0066] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 04/07/2017] [Indexed: 11/15/2022]
Abstract
The definitive genetic identification of Toxocara species is currently based on PCR/sequencing. The objectives of the present study were to design and conduct an in silico polymerase chain reaction-restriction fragment length polymorphism method for identification of Toxocara species. In silico analyses using the DNASIS and NEBcutter softwares were performed with rDNA internal transcribed spacers, and mitochondrial cox1 and nad1 sequences obtained in our previous studies along with relevant sequences deposited in GenBank. Consequently, RFLP profiles were designed and all isolates of T. canis and T. cati collected from dogs and cats in different geographical areas of Iran were investigated with the RFLP method using some of the identified suitable enzymes. The findings of in silico analyses predicted that on the cox1 gene only the MboII enzyme is appropriate for PCR-RFLP to reliably distinguish the two species. No suitable enzyme for PCR-RFLP on the nad1 gene was identified that yields the same pattern for all isolates of a species. DNASIS software showed that there are 241 suitable restriction enzymes for the differentiation of T. canis from T. cati based on ITS sequences. RsaI, MvaI and SalI enzymes were selected to evaluate the reliability of the in silico PCR-RFLP. The sizes of restriction fragments obtained by PCR-RFLP of all samples consistently matched the expected RFLP patterns. The ITS sequences are usually conserved and the PCR-RFLP approach targeting the ITS sequence is recommended for the molecular differentiation of Toxocara species and can provide a reliable tool for identification purposes particularly at the larval and egg stages.
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Zhou RQ, Ma GX, Korhonen PK, Luo YL, Zhu HH, Luo YF, Gasser RB, Xia QY. Comparative transcriptomic analyses of male and female adult Toxocara canis. Gene 2017; 600:85-89. [DOI: 10.1016/j.gene.2016.11.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 10/17/2016] [Accepted: 11/10/2016] [Indexed: 12/22/2022]
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Mizgajska-Wiktor H, Jarosz W, Fogt-Wyrwas R, Drzewiecka A. Distribution and dynamics of soil contamination with Toxocara canis and Toxocara cati eggs in Poland and prevention measures proposed after 20 years of study. Vet Parasitol 2017; 234:1-9. [DOI: 10.1016/j.vetpar.2016.12.011] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 12/14/2016] [Accepted: 12/15/2016] [Indexed: 11/25/2022]
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Gao X, Wang H, Li J, Qin H, Xiao J. Influence of land use and meteorological factors on the spatial distribution of Toxocara canis and Toxocara cati eggs in soil in urban areas. Vet Parasitol 2017; 233:80-85. [DOI: 10.1016/j.vetpar.2016.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 11/24/2016] [Accepted: 12/09/2016] [Indexed: 11/30/2022]
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Sperotto RL, Kremer FS, Aires Berne ME, Costa de Avila LF, da Silva Pinto L, Monteiro KM, Caumo KS, Ferreira HB, Berne N, Borsuk S. Proteomic analysis of Toxocara canis excretory and secretory (TES) proteins. Mol Biochem Parasitol 2016; 211:39-47. [PMID: 27638150 DOI: 10.1016/j.molbiopara.2016.09.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 09/09/2016] [Accepted: 09/12/2016] [Indexed: 11/29/2022]
Abstract
Toxocariasis is a neglected disease, and its main etiological agent is the nematode Toxocara canis. Serological diagnosis is performed by an enzyme-linked immunosorbent assay using T. canis excretory and secretory (TES) antigens produced by in vitro cultivation of larvae. Identification of TES proteins can be useful for the development of new diagnostic strategies since few TES components have been described so far. Herein, we report the results obtained by proteomic analysis of TES proteins using a liquid chromatography-tandem mass spectrometry (LC-MS/MS) approach. TES fractions were separated by one-dimensional SDS-PAGE and analyzed by LC-MS/MS. The MS/MS spectra were compared with a database of protein sequences deduced from the genome sequence of T. canis, and a total of 19 proteins were identified. Classification according to the signal peptide prediction using the SignalP server showed that seven of the identified proteins were extracellular, 10 had cytoplasmic or nuclear localization, while the subcellular localization of two proteins was unknown. Analysis of molecular functions by BLAST2GO showed that the majority of the gene ontology (GO) terms associated with the proteins present in the TES sample were associated with binding functions, including but not limited to protein binding (GO:0005515), inorganic ion binding (GO:0043167), and organic cyclic compound binding (GO:0097159). This study provides additional information about the exoproteome of T. canis, which can lead to the development of new strategies for diagnostics or vaccination.
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Affiliation(s)
- Rita Leal Sperotto
- Departamento de Microbiologia e Parasitologia, Universidade Federal de Pelotas (UFPel), Pelotas, Brazil
| | - Frederico Schmitt Kremer
- Laboratório de Biotecnologia Infecto-Parasitária, Centro de Desenvolvimento Tecnológico- UFPel, Pelotas, Brazil
| | | | - Luciana F Costa de Avila
- Departamento de Microbiologia e Parasitologia, Universidade Federal de Pelotas (UFPel), Pelotas, Brazil
| | - Luciano da Silva Pinto
- Laboratório de Biotecnologia Infecto-Parasitária, Centro de Desenvolvimento Tecnológico- UFPel, Pelotas, Brazil
| | - Karina Mariante Monteiro
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil; Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, UFRGS, Porto Alegre, Brazil
| | - Karin Silva Caumo
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil; Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, UFRGS, Porto Alegre, Brazil
| | - Henrique Bunselmeyer Ferreira
- Laboratório de Genômica Estrutural e Funcional, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil; Departamento de Biologia Molecular e Biotecnologia, Instituto de Biociências, UFRGS, Porto Alegre, Brazil
| | - Natália Berne
- Departamento de Microbiologia e Parasitologia, Universidade Federal de Pelotas (UFPel), Pelotas, Brazil
| | - Sibele Borsuk
- Laboratório de Biotecnologia Infecto-Parasitária, Centro de Desenvolvimento Tecnológico- UFPel, Pelotas, Brazil.
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Seroprevalence and associated risk factors of Toxocara infection in Korean, Manchu, Mongol, and Han ethnic groups in northern China. Epidemiol Infect 2016; 144:3101-3107. [PMID: 27457773 DOI: 10.1017/s0950268816001631] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Toxocariasis is a very prevalent zoonotic disease worldwide. Recently, investigators have focused more on Toxocara spp. seroprevalence in humans. Information regarding Toxocara seroprevalence in people from different ethnic backgrounds in China is limited. For this study, blood samples were collected from a total of 802 Han, 520 Korean, 303 Manchu, and 217 Mongol subjects from Jilin and Shandong provinces. The overall Toxocara seroprevalence was 16·07% (14·21% Han, 20·58% Korean, 11·22% Manchu, 18·89% Mongol). Living in suburban or rural areas, having dogs at home, exposure to soil, and consumption of raw/undercooked meat were risk factors for Toxocara infection. Exposure to soil was identified as the major risk factor for Toxocara seropositivity in all of the tested ethnicities. To the best of our knowledge, this is the first report concerning Toxocara infection in Manchus and Mongols in China. The present study provided baseline data for effective prevention strategies of toxocariasis in northeast China and recommends improvements in personal hygiene standards to achieve this goal.
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35
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Characterization and differential expression analysis of Toxocara canis aquaporin-1 gene. Parasitol Res 2016; 115:3631-6. [PMID: 27215210 DOI: 10.1007/s00436-016-5129-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Accepted: 05/12/2016] [Indexed: 01/07/2023]
Abstract
Toxocara canis is an intestinal nematode of canids with a worldwide distribution, causing an important but neglected parasitic zoonosis in humans. Aquaporins (AQP) are a family of water channel proteins, which function as membrane channels to regulate water homeostasis. In this study, the coding sequence of aquaporin-1 gene of T. canis (Tc-aqp-1) was cloned and characterized. The obtained Tc-aqp-1 coding sequence was 933 bp in length, which predicted to encode 311 amino acids. Two conserved asparagine-proline-alanine (NPA) motifs were identified in the multiple sequence alignments. Phylogenetic analysis revealed the closest relationship between T. canis and Opisthorchis viverrini based on aquaporin-1 amino acid sequence. A structure was predicted with ligand binding sites predicted at H93, N95, N226, L94, I79, and I210 and with active sites predicted at I256 and G207. Gene Ontology (GO) annotations predicted its cellular component term of integral component of plasma membrane (GO: 0005887), molecular function term of channel activity (GO: 0015250), and biological process term of water transport (GO: 0006833). Tissue expression analysis revealed that the Tc-aqp-1 was highly expressed in the intestine of adult male. The findings of the present study provide the basis for further functional studies of T. canis aquaporin-1.
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Ma G, Luo Y, Zhu H, Luo Y, Korhonen PK, Young ND, Gasser RB, Zhou R. MicroRNAs of Toxocara canis and their predicted functional roles. Parasit Vectors 2016; 9:229. [PMID: 27108220 PMCID: PMC4842261 DOI: 10.1186/s13071-016-1508-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 04/12/2016] [Indexed: 12/21/2022] Open
Abstract
Background Toxocara canis is the causative agent of toxocariasis of humans and other animals. This parasitic nematode (roundworm) has a complex life cycle, in which substantial developmental changes and switches occur. As small non-coding RNAs (sRNAs) are key regulators of gene expression in a wide range of organisms, we explored these RNAs in T. canis to provide a basis for future studies of its developmental biology as well as host interactions and disease at the molecular level. Methods We conducted high-throughput RNA sequencing and bioinformatic analyses to define sRNAs in individual male and female adults of T. canis. Results Apart from snRNA and snoRNA, 560 and 619 microRNAs (miRNAs), including 5 and 2 novel miRNAs, were identified in male and female worms, respectively, without piRNAs being detected in either sex. An analysis of transcriptional profiles showed that, of 564 miRNAs predicted as being differentially transcribed between male and female individuals of T. canis, 218 miRNAs were transcribed exclusively in male and 277 in female worms. Functional enrichment analysis predicted that both male and female miRNAs were mainly involved in regulating embryonic morphogenesis, hemidesmosome assembly and genetic information processing. The miRNAs differentially transcribed between the sexes were predicted to be associated with sex determination, embryonic morphogenesis and nematode larval development. The roles of miRNAs were predicted based on gene ontology (GO) and KEGG pathway annotations. The miRNAs Tc-miR-2305 and Tc-miR-6090 are proposed to have roles in reproduction, embryo development and larval development, and Tc-let-7-5p, Tc-miR-34 and Tc-miR-100 appear to be involved in host-parasite interactions. Together with published information from previous studies, some miRNAs (such as Tc-miR-2861, Tc-miR-2881 and Tc-miR-5126) are predicted to represent drug targets and/or associated with drug resistance. Conclusions This is the first exploration of miRNAs in T. canis, which could provide a basis for fundamental investigations of the developmental biology of the parasite, parasite-host interactions and toxocariasis as well as applied areas, such as the diagnosis of infection/disease, drug target discovery and drug resistance detection. Electronic supplementary material The online version of this article (doi:10.1186/s13071-016-1508-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Guangxu Ma
- Department of Veterinary Medicine, Rongchang Campus of Southwest University, Chongqing, 402460, The People's Republic of China.,Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Yongfang Luo
- Department of Veterinary Medicine, Rongchang Campus of Southwest University, Chongqing, 402460, The People's Republic of China
| | - Honghong Zhu
- Department of Veterinary Medicine, Rongchang Campus of Southwest University, Chongqing, 402460, The People's Republic of China
| | - Yongli Luo
- Department of Veterinary Medicine, Rongchang Campus of Southwest University, Chongqing, 402460, The People's Republic of China
| | - Pasi K Korhonen
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Neil D Young
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Robin B Gasser
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria, 3010, Australia.
| | - Rongqiong Zhou
- Department of Veterinary Medicine, Rongchang Campus of Southwest University, Chongqing, 402460, The People's Republic of China.
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Duan H, Gao JF, Su X, Fu X, Yue DM, Gao Y, Qiu JH, Wang CR. Genetic variation between and within Triodontophorus brevicauda and Triodontophorus nipponicus revealed by analyses of mtDNA and rDNA gene sequences. Mitochondrial DNA A DNA Mapp Seq Anal 2016; 28:570-574. [PMID: 27159713 DOI: 10.3109/24701394.2016.1157867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Triodontophorus spp. parasitizes the large intestine of equine, causing strongylid diseases. The present study assessed genetic variation in five gene regions within and between Triodontophorus brevicauda and Triodontophorus nipponicus from Heilongjiang Province and the Inner Mongolia Autonomous region. The five gene markers were three mitochondrial (mt) genes, cytochrome c oxidase subunit I (cox1), NADH dehydrogenase subunit 5 (nad5), cytochrome b (cytb); and two ribosomal RNA genes, the internal transcribed spacer 1 (ITS1) and the internal transcribed spacer 2 (ITS2). Partial (p) sequences of cox1, nad5, cytb and the complete ITS rDNA region were PCR amplified from individual nematodes, and the amplicons were subjected to sequencing in both directions. The size of the three mt genes is identical in both species: 761 bp (p cox1), 505 bp (pnad5) and 562 bp (pcytb); the length of the two ribosomal genes is different: 376 bp and 370 bp (ITS1), and 333 bp and 322 bp (ITS2), respectively. Intraspecific variation between T. brevicauda and T. nipponicus was 0-1.5% and 0-1.1% for pcox1, 0-2.0% and 0-2.0% for pnad5, 0-1.4% and 0-2.2% for pcytb, 0-0.8% and 0-1.1% for ITS1 and 0-0.9% and 0-2.2% for ITS2. Interspecific variation within the nematodes was 13.5-14.3% for pcox1, 15.5-18.7% for pnad5, 16.7-18.6% for pcytb, 11.5-13.1% for ITS1 and 16.0-18.4% for ITS2. Phylogenetic analyses based on the combined mt gene sequences, as well as with the ITS sequences, show each species forming a monophyletic group of individuals. However, samples of different species from the same geographical origin did not always cluster together. These results provide valuable information for further studies of systematics and population genetics of the genus Triodontophorus.
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Affiliation(s)
- Hong Duan
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Jun-Feng Gao
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Xin Su
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Xue Fu
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Dong-Mei Yue
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Yuan Gao
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Jian-Hua Qiu
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
| | - Chun-Ren Wang
- a College of Animal Science and Veterinary Medicine , Heilongjiang Bayi Agricultural University , Daqing , Heilongjiang Province , PR China
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Zaia MG, Oliveira SRPD, Castro CAD, Soares EG, Afonso A, Monnazzi LGS, Peitl Filho O, Faccioli LH, Anibal FDF. Toxocara canis and the allergic process. Mem Inst Oswaldo Cruz 2016; 110:726-31. [PMID: 26517650 PMCID: PMC4667574 DOI: 10.1590/0074-02760150051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 07/10/2015] [Indexed: 11/22/2022] Open
Abstract
The protective effect of infectious agents against allergic reactions has been thoroughly investigated. Current studies have demonstrated the ability of some helminths to modulate the immune response of infected hosts. The objective of the present study was to investigate the relationship between Toxocara canis infection and the development of an allergic response in mice immunised with ovalbumin (OVA). We determined the total and differential blood and bronchoalveolar lavage fluid cells using BALB/c mice as a model. To this end, the levels of interleukin (IL)-4, IL-5 and IL-10 and anti-OVA-IgE were measured using an ELISA. The inflammatory process in the lungs was observed using histology slides stained with haematoxylin and eosin. The results showed an increase in the total number of leukocytes and eosinophils in the blood of infected and immunised animals at 18 days after infection. We observed a slight lymphocytic inflammatory infiltrate in the portal space in all infected mice. Anti-OVA-IgE levels were detected in smaller proportions in the plasma of immunised and infected mice compared with mice that were only infected. Therefore, we concluded that T. canis potentiates inflammation in the lungs in response to OVA, although anti-OVA-IgE levels suggest a potential reduction of the inflammatory process through this mechanism.
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Affiliation(s)
- Mauricio Grecco Zaia
- Departamento de Morfologia e Patologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, SP, Brasil
| | | | - Cynthia Aparecida de Castro
- Departamento de Ciências Fisiológicas, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - Edson Garcia Soares
- Departamento de Patologia e Medicina Legal, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Ana Afonso
- Departamento de Morfologia e Patologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, SP, Brasil
| | - Luis Gustavo S Monnazzi
- Centro de Ciências Biológicas e da Saúde, Centro Universitário de Araraquara, Araraquara, SP, Brasil
| | - Oscar Peitl Filho
- Departamento de Engenharia de Materiais, Universidade Federal de São Carlos, São Carlos, SP, Brasil
| | - Lúcia Helena Faccioli
- Departamento de Análises Clínicas, Toxicológicas e Bromatológicas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brasil
| | - Fernanda de Freitas Anibal
- Departamento de Morfologia e Patologia, Centro de Ciências Biológicas e da Saúde, Universidade Federal de São Carlos, SP, Brasil
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Cong W, Meng QF, You HL, Zhou N, Dong XY, Dong W, Wang XY, Qian AD, Zhu XQ. Seroprevalence and risk factors of Toxocara infection among children in Shandong and Jilin provinces, China. Acta Trop 2015; 152:215-219. [PMID: 26384456 DOI: 10.1016/j.actatropica.2015.09.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Revised: 09/05/2015] [Accepted: 09/12/2015] [Indexed: 11/18/2022]
Abstract
This cross-sectional study was aimed to investigate the Toxocara serology in children in Shandong and Jilin provinces, China using an enzyme-linked immunosorbent assay (ELISA). The overall Toxocara seroprevalence among the study population (n=1458) was 19.3%, sick children (26.4%) had significantly higher seroprevalence than clinically healthy children (14.4%) (P<0.05), and the highest Toxocara seroprevalence was found in children suffering from chronic cough (40.6%), followed by recurrent abdominal pain (40.0%), recurrent headache (38.1%), slight fever (36.2%), and recurrent vomiting (31.6%). Place of residence, education level, type of school, keeping dogs at home, contact with dogs and cats and exposure with soil were found to be associated with Toxocara infection. Our findings show that children infection with Toxocara is common in Shandong and Jilin provinces, eastern and northeastern China, indicating an immediate need for implementing strategies and measures to prevent and control Toxocara infection in children in China.
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Affiliation(s)
- Wei Cong
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China; College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, PR China
| | - Qing-Feng Meng
- Jilin Entry-Exit Inspection and Quarantine Bureau, Changchun, Jilin Province 130000, PR China
| | - Hai-Long You
- The First Affilliated Hospital of Jilin University, Changchun, Jilin Province 130000, PR China
| | - Na Zhou
- Affilliated Hospital of Medical College, Qingdao University, Qingdao, Shandong Province 266000, PR China
| | - Xiao-Yan Dong
- Wendeng Stomatological Hospital, Weihai, Shandong Province 264400, PR China
| | - Wei Dong
- Weihaiwei People's Hospital, Weihai, Shandong Province 264200, PR China
| | - Xiang-Yang Wang
- Wendeng Municipal Hospital, Weihai, Shandong Province 264400, PR China
| | - Ai-Dong Qian
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province 130118, PR China
| | - Xing-Quan Zhu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China.
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40
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Resende NM, Gazzinelli-Guimarães PH, Barbosa FS, Oliveira LM, Nogueira DS, Gazzinelli-Guimarães AC, Gonçalves MTP, Amorim CCO, Oliveira FMS, Caliari MV, Rachid MA, Volpato GT, Bueno LL, Geiger SM, Fujiwara RT. New insights into the immunopathology of early Toxocara canis infection in mice. Parasit Vectors 2015; 8:354. [PMID: 26135397 PMCID: PMC4494798 DOI: 10.1186/s13071-015-0962-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 06/17/2015] [Indexed: 01/19/2023] Open
Abstract
Background Nematodes of the genus Toxocara are cosmopolitan roundworms frequently found in dogs and cats. Toxocara spp. can accidentally infect humans and cause a zoonosis called human toxocariasis, which is characterized by visceral, ocular or cerebral migration of larval stages of the parasite, without completing its life cycle. In general, chronic nematode infections induce a polarized TH2 immune response. However, during the initial phase of infection, a strong pro-inflammatory response is part of the immunological profile and might determine the outcome and/or pathology of the infection. Methods Parasitological aspects and histopathology during larval migration were evaluated after early T. canis experimental infection of BALB/c mice, which were inoculated via the intra-gastric route with a single dose of 1000 fully embryonated eggs. Innate immune responses and systemic cytokine patterns (TH1, TH2, TH17 and regulatory cytokines) were determined at different times after experimental challenge by sandwich ELISA. Results We found that experimental infection with T. canis induced a mix of innate inflammatory/TH17/TH2 responses during early infection, with a predominance of the latter. The TH2 response was evidenced by significant increases in cytokines such as IL-4, IL-5, IL-13 and IL-33, in addition to increasing levels of IL-6 and IL-17. No significant increases were observed for IL-10, TNF-α or IFN-γ levels. In parallel, parasitological analysis clearly revealed the pattern of larval migration through the mouse organs, starting from the liver in the first 24 h of infection, reaching the peak in the lungs on the 3rd day of infection and finally being found numerously in the brain after 5 days of infection. Peripheral leukocytosis, characterized by early neutrophilia and subsequent eosinophilia, was remarkable during early infection. The tissue damage induced by larvae was evidenced by histopathological analysis of the organs at different time points of infection. In all of the affected organs, larval migration induced intense inflammatory infiltrate and hemorrhage. Conclusion In conclusion, these new insights into early T. canis infection in mice presented here enabled a better understanding of the immunopathological events that might also occur during human toxocariasis, thus contributing to future strategies of diagnosis and control.
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Affiliation(s)
- Nathália M Resende
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. .,Laboratório de Fisiologia de Sistemas e Toxicologia Reprodutiva, Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, Brazil.
| | | | - Fernando S Barbosa
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Luciana M Oliveira
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Denise S Nogueira
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Ana Clara Gazzinelli-Guimarães
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Marco Túlio P Gonçalves
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Chiara C O Amorim
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Fabrício M S Oliveira
- Departamento de Patologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Marcelo V Caliari
- Departamento de Patologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Milene A Rachid
- Departamento de Patologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Gustavo T Volpato
- Laboratório de Fisiologia de Sistemas e Toxicologia Reprodutiva, Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso, Barra do Garças, Brazil.
| | - Lilian L Bueno
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Stefan M Geiger
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
| | - Ricardo T Fujiwara
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
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Proteinases in excretory-secretory products of Toxocara canis second-stage larvae: zymography and modeling insights. BIOMED RESEARCH INTERNATIONAL 2014; 2014:418708. [PMID: 25197645 PMCID: PMC4150453 DOI: 10.1155/2014/418708] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Accepted: 07/15/2014] [Indexed: 11/18/2022]
Abstract
Components released in excretory-secretory products of Toxocara canis larvae (TES) include phosphatidylethanolamine-binding proteins (TES26), mucins (TES120, MUC2-5), and C-type lectins (TES32, TES70) and their biochemical, immunological, and diagnostic properties have been extensively studied albeit proteinase activities towards physiological substrates are almost unknown. Proteolytic activities in TES samples were first analyzed by gel electrophoresis with gelatin as substrate. Major activities of ~400, 120, and 32 kDa in TES were relatively similar over a broad pH range (5.5–9.0) and all these were of the serine-type as leupeptin abolished gelatinolysis. Further, the ~400 kDa component degraded all physiological substrates tested (laminin, fibronectin, albumin, and goat IgG) and the 120 kDa component degraded albumin and goat IgG while proteinases of lower MW (45, 32, and 26 kDa) only degraded laminin and fibronectin, preferentially at alkaline pH (9.0). By protein modeling approaches using the known sequences of TES components, only TES26 and MUC4 displayed folding patterns significantly related to reference serine proteinases. These data suggest that most of serine proteinase activities secreted in vitro by infective larvae of T. canis have intriguing nature but otherwise help the parasite to affect multiple components of somatic organs and bodily fluids within the infected host.
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Cong W, Zhang XX, Zhou N, Yu CZ, Chen J, Wang XY, Li B, Qian AD, Zhu XQ. Toxocara seroprevalence among clinically healthy individuals, pregnant women and psychiatric patients and associated risk factors in Shandong Province, Eastern China. PLoS Negl Trop Dis 2014; 8:e3082. [PMID: 25101756 PMCID: PMC4125144 DOI: 10.1371/journal.pntd.0003082] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2014] [Accepted: 06/27/2014] [Indexed: 01/07/2023] Open
Abstract
BACKGROUND Toxocarosis is a widespread zoonosis caused by the ascarid nematodes Toxocara canis and Toxocara cati, which primarily infect dogs and cats, respectively. Most human infections with Toxocara are asymptomatic; however, some infected individuals may develop a serious illness and even death. Nevertheless, epidemiological knowledge regarding the prevalence and risks associated with Toxocara infection is limited in China. Therefore, we performed a cross-sectional pilot study and estimated the seroprevalence of Toxocara infection in humans in Shandong Province, eastern China for the first time, from June 2011 to July 2013, involving clinically healthy individuals, pregnant women and psychiatric patients, aiming to attract public attention to Toxocara infection. METHODOLOGY/PRINCIPLE FINDINGS Seroprevalence of Toxocara was determined using an enzyme-linked immunosorbent assay based on a cross-sectional study conducted in Qingdao and Weihai, Shandong Province, eastern China. Factors potentially associated with Toxocara infection were identified by logistic regression analysis. The overall Toxocara seroprevalence among the study population (n = 2866) was 12.25%, and a significantly higher seroprevalence in psychiatric patients (16.40%, 73/445) than that in clinically healthy individuals (13.07%, 187/1431) and pregnant women (9.19%, 91/990) was revealed. Univariate analyses suggested that keeping dogs at home (OR = 0.06, 95% CI 0.05-0.08, P<0.001), contact with cats and dogs (OR = 0.42, 95% CI 0.33-0.53, P<0.001) and exposure with soil (OR = 0.37, 95% CI 0.28-0.49, P<0.001) were risk factors associated with Toxocara infection. CONCLUSIONS/SIGNIFICANCE The present study revealed, for the first time, that human infection with Toxocara is common in eastern China, posing a significant public health concern. Increasing human and dog populations, population movements and climate change all will serve to increase the importance of this zoonosis. Further studies under controlled conditions are necessary to define potential morbidity associated with Toxocara infection.
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Affiliation(s)
- Wei Cong
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, People′s Republic of China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province, People′s Republic of China
| | - Xiao-Xuan Zhang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, People′s Republic of China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province, People′s Republic of China
| | - Na Zhou
- Affiliated Hospital of Medical College, Qingdao University, Qingdao, Shandong Province, People′s Republic of China
| | - Chang-Zheng Yu
- Weihai Wendeng Central Hospital, Weihai, Shandong Province, People′s Republic of China
| | - Jia Chen
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, People′s Republic of China
| | - Xiang-Yang Wang
- Wendeng Municipal Hospital, Weihai, Shandong Province, People′s Republic of China
| | - Bing Li
- Wendeng People's Hospital, Weihai, Shandong Province, People′s Republic of China
| | - Ai-Dong Qian
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province, People′s Republic of China
| | - Xing-Quan Zhu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province, People′s Republic of China
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, Jilin Province, People′s Republic of China
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Sequence variation in mitochondrial cox1 and nad1 genes of ascaridoid nematodes in cats and dogs from Iran. J Helminthol 2014; 89:496-501. [PMID: 24717402 DOI: 10.1017/s0022149x14000133] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The study was conducted to determine the sequence variation in two mitochondrial genes, namely cytochrome c oxidase 1 (pcox1) and NADH dehydrogenase 1 (pnad1) within and among isolates of Toxocara cati, Toxocara canis and Toxascaris leonina. Genomic DNA was extracted from 32 isolates of T. cati, 9 isolates of T. canis and 19 isolates of T. leonina collected from cats and dogs in different geographical areas of Iran. Mitochondrial genes were amplified by polymerase chain reaction (PCR) and sequenced. Sequence data were aligned using the BioEdit software and compared with published sequences in GenBank. Phylogenetic analysis was performed using Bayesian inference and maximum likelihood methods. Based on pairwise comparison, intra-species genetic diversity within Iranian isolates of T. cati, T. canis and T. leonina amounted to 0-2.3%, 0-1.3% and 0-1.0% for pcox1 and 0-2.0%, 0-1.7% and 0-2.6% for pnad1, respectively. Inter-species sequence variation among the three ascaridoid nematodes was significantly higher, being 9.5-16.6% for pcox1 and 11.9-26.7% for pnad1. Sequence and phylogenetic analysis of the pcox1 and pnad1 genes indicated that there is significant genetic diversity within and among isolates of T. cati, T. canis and T. leonina from different areas of Iran, and these genes can be used for studying genetic variation of ascaridoid nematodes.
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Ma GX, Zhou RQ, Hu SJ, Huang HC, Zhu T, Xia QY. Molecular characterization and functional analysis of serine/threonine protein phosphatase of Toxocara canis. Exp Parasitol 2014; 141:55-61. [PMID: 24657583 DOI: 10.1016/j.exppara.2014.03.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Accepted: 03/12/2014] [Indexed: 11/19/2022]
Abstract
Toxocara canis (T. canis) is a widely prevalent zoonotic parasite that infects a wide range of mammalian hosts, including humans. We generated the full-length complementary DNA (cDNA) of the serine/threonine phosphatase gene of T. canis (Tc stp) using 5' rapid amplification of the cDNA ends. The 1192-bp sequence contained a continuous 942-nucleotide open reading frame, encoding a 313-amino-acid polypeptide. The Tc STP polypeptide shares a high level of amino-acid sequence identity with the predicted STPs of Loa loa (89%), Brugia malayi (86%), Oesophagostomum columbianum (76%), and Oesophagostomumdentatum (76%). The Tc STP contains GDXHG, GDXVDRG, GNHE motifs, which are characteristic of members of the phosphoprotein phosphatase family. Our quantitative real-time polymerase chain reaction analysis showed that the Tc STP was expressed in six different tissues in the adult male, with high-level expression in the spermary, vas deferens, and musculature, but was not expressed in the adult female, suggesting that Tc STP might be involved in spermatogenesis and mating behavior. Thus, STP might represent a potential molecular target for controlling T. canis reproduction.
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Affiliation(s)
- Guang Xu Ma
- Department of Veterinary Medicine, Rongchang Campus, Southwest University, Chongqing 402460, People's Republic of China
| | - Rong Qiong Zhou
- Department of Veterinary Medicine, Rongchang Campus, Southwest University, Chongqing 402460, People's Republic of China.
| | - Shi Jun Hu
- Department of Veterinary Medicine, Rongchang Campus, Southwest University, Chongqing 402460, People's Republic of China
| | - Han Cheng Huang
- Department of Veterinary Medicine, Rongchang Campus, Southwest University, Chongqing 402460, People's Republic of China
| | - Tao Zhu
- Department of Veterinary Medicine, Rongchang Campus, Southwest University, Chongqing 402460, People's Republic of China
| | - Qing You Xia
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400715, People's Republic of China.
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Sabino R, Rodrigues R, Costa I, Carneiro C, Cunha M, Duarte A, Faria N, Ferreira FC, Gargaté MJ, Júlio C, Martins ML, Nevers MB, Oleastro M, Solo-Gabriele H, Veríssimo C, Viegas C, Whitman RL, Brandão J. Routine screening of harmful microorganisms in beach sands: implications to public health. THE SCIENCE OF THE TOTAL ENVIRONMENT 2014; 472:1062-1069. [PMID: 24355396 DOI: 10.1016/j.scitotenv.2013.11.091] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 10/29/2013] [Accepted: 11/18/2013] [Indexed: 06/03/2023]
Abstract
Beaches worldwide provide recreational opportunities to hundreds of millions of people and serve as important components of coastal economies. Beach water is often monitored for microbiological quality to detect the presence of indicators of human sewage contamination so as to prevent public health outbreaks associated with water contact. However, growing evidence suggests that beach sand can harbor microbes harmful to human health, often in concentrations greater than the beach water. Currently, there are no standards for monitoring, sampling, analyzing, or managing beach sand quality. In addition to indicator microbes, growing evidence has identified pathogenic bacteria, viruses, and fungi in a variety of beach sands worldwide. The public health threat associated with these populations through direct and indirect contact is unknown because so little research has been conducted relating to health outcomes associated with sand quality. In this manuscript, we present the consensus findings of a workshop of experts convened in Lisbon, Portugal to discuss the current state of knowledge on beach sand microbiological quality and to develop suggestions for standardizing the evaluation of sand at coastal beaches. The expert group at the "Microareias 2012" workshop recommends that 1) beach sand should be screened for a variety of pathogens harmful to human health, and sand monitoring should then be initiated alongside regular water monitoring; 2) sampling and analysis protocols should be standardized to allow proper comparisons among beach locations; and 3) further studies are needed to estimate human health risk with exposure to contaminated beach sand. Much of the manuscript is focused on research specific to Portugal, but similar results have been found elsewhere, and the findings have worldwide implications.
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Affiliation(s)
- R Sabino
- Reference Unit for Systemic Infections and Zoonosis, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - R Rodrigues
- Microbiology Laboratory, Department of Environmental Health, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - I Costa
- Laboratory of Molecular Biology, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016 Lisbon, Portugal
| | - C Carneiro
- REQUIMTE/Centro de Química Fina e Biotecnologia, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal
| | - M Cunha
- Portuguese Environment Agency, Environment Reference Laboratory, Portugal
| | - A Duarte
- Faculty of Pharmacy, iMed.UL-Research Institute for Medicines and Pharmaceutical Sciences, University of Lisboa, Portugal
| | - N Faria
- Microbiology Laboratory, Department of Environmental Health, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - F C Ferreira
- Microbiology Laboratory, Department of Environmental Health, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - M J Gargaté
- Reference Unit for Systemic Infections and Zoonosis, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - C Júlio
- Reference Unit for Gastro-intestinal Infections, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - M L Martins
- Unit of Medical Microbiology, Instituto de Higiene e Medicina Tropical-Centro de Recursos Microbiológicos (CREM), Universidade Nova de Lisboa (UNL), Portugal
| | - M B Nevers
- United States Geological Survey, Great Lakes Science Center, Porter, IN, USA
| | - M Oleastro
- Laboratory of Molecular Biology, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016 Lisbon, Portugal
| | - H Solo-Gabriele
- Department of Civil, Architectural, and Environmental Engineering, University of Miami, Coral Gables, FL, USA
| | - C Veríssimo
- Reference Unit for Systemic Infections and Zoonosis, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Portugal
| | - C Viegas
- Lisbon School of Health Technology, Polytechnic Institute of Lisboa, Portugal
| | - R L Whitman
- United States Geological Survey, Great Lakes Science Center, Porter, IN, USA
| | - J Brandão
- Reference Unit for Systemic Infections and Zoonosis, Department of Infectious Diseases, National Institute of Health Dr. Ricardo Jorge, Portugal.
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McGuinness SL, Leder K. Global Burden of Toxocariasis: A Common Neglected Infection of Poverty. CURRENT TROPICAL MEDICINE REPORTS 2014. [DOI: 10.1007/s40475-013-0012-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Liu GH, Zhou DH, Zhao L, Xiong RC, Liang JY, Zhu XQ. The complete mitochondrial genome of Toxascaris leonina: Comparison with other closely related species and phylogenetic implications. INFECTION GENETICS AND EVOLUTION 2013; 21:329-33. [PMID: 24316156 DOI: 10.1016/j.meegid.2013.11.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 11/11/2013] [Accepted: 11/26/2013] [Indexed: 01/15/2023]
Abstract
Adults of Toxascaris leonina (Nematoda: Ascarididae) live in the gastrointestinal tract of both dogs and cats, and cause significant economic losses and potential public health problem worldwide. Although many studies have given insights into this significant pathogen, to date, the complete mitochondrial (mt) genome sequence is still not available for T. leonina. Here, we sequenced the complete mt genome of T. leonina. This AT-rich (71.53%) mt genome (14,310bp) is circular and consists of 36 genes, including 12 genes for proteins, 2 genes for rRNA and 22 genes for tRNA. All mt genes of T. leonina are transcribed in the same direction. The gene order is the same as those of Ascaris spp. (Ascarididae), Toxocara spp. (Toxocaridae), Anisakis simplex and Contracaecum rudolphii B (Anisakidae), but distinct from that of Ascaridia spp. (Ascaridiidae). Phylogenetic analyses using concatenated amino acid sequences of 12 protein-coding genes by Bayesian inference (BI) showed distinct groups with high statistical support, and our data confirm that T. leonina is a member of the Ascarididae, and that this family is more closely related to the Toxocaridae rather than the Anisakidae within the Ascaridoidea. The determination of mt genome sequences of T. leonina provides novel genetic markers for studies into the systematics, population genetics and epidemiology of this parasite.
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Affiliation(s)
- Guo-Hua Liu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China; College of Veterinary Medicine, Hunan Agricultural University, Changsha, Hunan Province 410128, PR China
| | - Dong-Hui Zhou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China.
| | - Lei Zhao
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China; College of Animal Science and Technology, Jilin Agriculture University, Changchun 130118, PR China
| | - Rong-Chuan Xiong
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, PR China
| | - Jian-Ying Liang
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China; College of Veterinary Medicine, South China Agricultural University, Guangzhou, Guangdong Province 510642, PR China
| | - Xing-Quan Zhu
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, Gansu Province 730046, PR China; College of Veterinary Medicine, Hunan Agricultural University, Changsha, Hunan Province 410128, PR China; College of Animal Science and Technology, Jilin Agriculture University, Changchun 130118, PR China.
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48
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The epidemiology and public health importance of toxocariasis: A zoonosis of global importance. Int J Parasitol 2013; 43:999-1008. [DOI: 10.1016/j.ijpara.2013.07.004] [Citation(s) in RCA: 264] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 07/16/2013] [Accepted: 07/18/2013] [Indexed: 11/21/2022]
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Van De N, Trung NV, Duyet LV, Chai JY. Molecular diagnosis of an ocular toxocariasis patient in Vietnam. THE KOREAN JOURNAL OF PARASITOLOGY 2013; 51:563-7. [PMID: 24327783 PMCID: PMC3857505 DOI: 10.3347/kjp.2013.51.5.563] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Revised: 08/21/2013] [Accepted: 09/04/2013] [Indexed: 11/23/2022]
Abstract
An ocular Toxocara canis infection is reported for the first time in Vietnam. A 34-year-old man residing in a village of Son La Province, North Vietnam, visited the National Eye Hospital (NEH) in August 2011. He felt a bulge-sticking pain in his left eye and loss of vision occurred over 3 months before visiting the hospital. The eye examination in the hospital showed damage of the left eye, red eye, retinal fibrosis, retinal detachment, inflammation of the eye tissues, retinal granulomas, and a parasitic cyst inside. A larva of Toxocara was collected with the cyst by a medical doctor by surgery. Comparison of 264 nucleotides of internal transcribed spacer 2 (ITS2) of ribosomal DNA was done between our Vietnamese Toxocara canis and other Toxocara geographical isolates, including Chinese T. canis, Japanese T. canis, Sri Lankan T. canis, and Iranian T. canis. The nucleotide homology was 97-99%, when our T. canis was compared with geographical isolates. Identification of a T. canis infection in the eye by a molecular method was performed for the first time in Vietnam.
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Affiliation(s)
- Nguyen Van De
- Department of Parasitology, Hanoi Medical University, Hanoi, Vietnam
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50
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Durant JF, Irenge LM, Fogt-Wyrwas R, Dumont C, Doucet JP, Mignon B, Losson B, Gala JL. Duplex quantitative real-time PCR assay for the detection and discrimination of the eggs of Toxocara canis and Toxocara cati (Nematoda, Ascaridoidea) in soil and fecal samples. Parasit Vectors 2012; 5:288. [PMID: 23216873 PMCID: PMC3533947 DOI: 10.1186/1756-3305-5-288] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 11/23/2012] [Indexed: 11/19/2022] Open
Abstract
Background Toxocarosis is a zoonotic disease caused by Toxocara canis (T. canis) and/or Toxocara cati (T. cati), two worldwide distributed roundworms which are parasites of canids and felids, respectively. Infections of humans occur through ingestion of embryonated eggs of T. canis or T. cati, when playing with soils contaminated with dogs or cats feces. Accordingly, the assessment of potential contamination of these areas with these roundworms eggs is paramount. Methods A duplex quantitative real-time PCR (2qPCR) targeting the ribosomal RNA gene internal transcribed spacer (ITS2) has been developed and used for rapid and specific identification of T. canis and T. cati eggs in fecal and soil samples. The assay was set up on DNA samples extracted from 53 adult worms including T. canis, T. cati, T. leonina, Ascaris suum (A. suum) and Parascaris equorum (P. equorum). The assay was used to assess the presence of T. cati eggs in several samples, including 12 clean soil samples spiked with eggs of either T. cati or A. suum, 10 actual soil samples randomly collected from playgrounds in Brussels, and fecal samples from cats, dogs, and other animals. 2qPCR results on dogs and cats fecal samples were compared with results from microscopic examination. Results 2qPCR assay allowed specific detection of T. canis and T. cati, whether adult worms, eggs spiked in soil or fecal samples. The 2qPCR limit of detection (LOD) in spiked soil samples was 2 eggs per g of soil for a turnaround time of 3 hours. A perfect concordance was observed between 2qPCR assay and microscopic examination on dogs and cats feces. Conclusion The newly developed 2qPCR assay can be useful for high throughput prospective or retrospective detection of T.canis and/or T. cati eggs in fecal samples as well as in soil samples from playgrounds, parks and sandpits.
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Affiliation(s)
- Jean-Francois Durant
- Centre de Technologies Moléculaires Appliquées, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Clos Chapelle-aux-Champs, 30 B1.30.24, 1200 Brussels, Belgium
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