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1.
Infection ; 51(4): 1127-1139, 2023 Aug.
Article de Anglais | MEDLINE | ID: mdl-36961623

RÉSUMÉ

PURPOSE: Neurocysticercosis is common in regions endemic for Taenia solium. Active-stage neurocysticercosis can be treated with antiparasitic medication, but so far no study on efficacy and safety has been conducted in Africa. METHODS: We conducted a prospective cohort study on treatment of neurocysticercosis in Tanzania between August 2018 and January 2022. Patients were initially treated with albendazole (15 mg/kg/d) for 10 days and followed up for 6 months. Additionally in July 2021, all participants who then still had cysts were offered a combination therapy consisting of albendazole (15 mg/kg/d) and praziquantel (50 mg/kg/d). Antiparasitic treatment was accompanied by corticosteroid medication and anti-seizure medication if the patient had experienced epileptic seizures before treatment. RESULTS: Sixty-three patients were recruited for this study, of whom 17 had a complete follow-up after albendazole monotherapy. These patients had a total of 138 cysts at baseline, of which 58 (42%) had disappeared or calcified by the end of follow-up. The median cyst reduction was 40% (interquartile range 11-63%). Frequency of epileptic seizures reduced considerably (p < 0.001). Three patients had all active cysts resolved or calcified and of the remaining 14, eight received the combination therapy which resolved 63 of 66 cysts (95%). Adverse events were infrequent and mild to moderate during both treatment cycles. CONCLUSION: Cyst resolution was unsatisfactory with albendazole monotherapy but was very high when it was followed by a combination of albendazole and praziquantel.


Sujet(s)
Anthelminthiques , Kystes , Neurocysticercose , Humains , Neurocysticercose/traitement médicamenteux , Neurocysticercose/complications , Neurocysticercose/parasitologie , Albendazole/effets indésirables , Antiparasitaires/effets indésirables , Praziquantel/effets indésirables , Tanzanie , Études prospectives , Kystes/induit chimiquement , Kystes/complications , Kystes/traitement médicamenteux , Crises épileptiques/traitement médicamenteux , Crises épileptiques/induit chimiquement , Crises épileptiques/complications , Anthelminthiques/effets indésirables
2.
Vet Parasitol Reg Stud Reports ; 22: 100470, 2020 12.
Article de Anglais | MEDLINE | ID: mdl-33308751

RÉSUMÉ

A cross-sectional systematic sampling was carried out during three consecutive winters from 2012 to 2015, to update the knowledge on the fox tapeworm (Echinococcus multilocularis) distribution in the red fox (Vulpes vulpes) in Flanders. Earlier studies reported the low endemicity status of this tapeworm in the northern region of Belgium, in contrast to the south of the country and neighbouring countries. Using a modified Segmental Sedimentation and Counting Technique, followed by PCR-RFLP and sequencing, 923 foxes' intestines were examined for the presence of E. multilocularis. Based on microscopic examination, 38 out of 923 foxes were suspected to be infected with either E. multilocularis or Amoebotaenia spp., of which 19 were molecularly confirmed to be E. multilocularis, 18 were found positive for Amoebotaenia spp. and one was negative. The overall prevalence for E. multilocularis of 2.1% confirms the low endemicity of the fox tapeworm in Flanders. However, in one area in the most eastern part of Flanders (Voeren), neighbouring the Netherlands and Wallonia, a prevalence of 57% (12/21) was observed. Continuous monitoring of the fox tapeworm remains needed to assess spatio-temporal trends in distribution and to assess the risk of this zoonotic infection in Europe. The challenging differential diagnosis of E. multilocularis and Amoebotaenia spp. based on microscopic examination calls for attention.


Sujet(s)
Échinococcose/médecine vétérinaire , Echinococcus multilocularis/physiologie , Renards , Animaux , Belgique/épidémiologie , Cestoda/physiologie , Études transversales , Diagnostic différentiel , Échinococcose/diagnostic , Échinococcose/épidémiologie , Prévalence
3.
J Helminthol ; 94: e201, 2020 Oct 14.
Article de Anglais | MEDLINE | ID: mdl-33050957

RÉSUMÉ

Pigs act as the intermediate hosts of the zoonotic tapeworms Taenia solium and Taenia asiatica, as well as of the non-zoonotic Taenia hydatigena. In Vietnam, human taeniasis and cysticercosis have been reported throughout the country; however, data on porcine cysticercosis are scarce. Our study aimed to estimate the prevalence of Taenia spp. in slaughtered pigs in two districts in Phu Tho, a mountainous province in northern Vietnam from where neurocysticercosis patients commonly originate. The carcasses of 399 pigs from 51 small-scale abattoirs were checked for cysticerci, while tongue, liver, masseter muscles, diaphragm and heart were sliced and examined. Retrieved cysticerci underwent polymerase chain reaction-restriction fragment length polymorphism and sequencing for species confirmation. Blood was also collected to detect antibodies by lentil lectin-purified glycoprotein enzyme-linked immunoelectrotransfer blot (LLGP-EITB) and recombinant T24H antigen (rT24H)-EITB and circulating antigens by B158/B60 Ag-ELISA. In two pigs, T. asiatica cysticerci were found, confirming the presence of the parasite in pigs in Vietnam at a low prevalence (0.5%; 95% exact confidence interval (CI): 0-1.19%). Cysticerci of T. solium were found in none of the pigs, although one serum sample was positive for antibodies in both LLGP-EITB and rT24H-EITB. Furthermore, a high prevalence of T. hydatigena cysticercosis was observed (18.0%; 95% Wilson score CI: 14.6-22.1%). In more than half of the T. hydatigena-positive pigs, circulating antigens were detected by Ag-ELISA, confirming that this test cannot be used to diagnose T. solium cysticercosis in this region. Finally, Spirometra erinaceieuropaei was found in one pig liver. It is the first record of this zoonotic cestode species in pigs in Vietnam. Overall, the findings confirmed the complex epidemiology of Taenia spp. in pigs in Vietnam.


Sujet(s)
Maladies des porcs/parasitologie , Taenia/isolement et purification , Taeniase/épidémiologie , Abattoirs , Animaux , Anticorps antihelminthe/sang , Humains , Viande/parasitologie , Polymorphisme de restriction , Prévalence , Suidae , Maladies des porcs/épidémiologie , Taenia/classification , Taeniase/parasitologie , Vietnam/épidémiologie
4.
Epidemiol Infect ; 147: e154, 2019 01.
Article de Anglais | MEDLINE | ID: mdl-31063104

RÉSUMÉ

Cytomegalovirus (CMV) infection is endemic worldwide but its seroprevalence varies widely. The goal of this study was to estimate the age-specific seroprevalence of CMV infection in Belgium based on two cross-sectional serological datasets from 2002 and 2006. The seroprevalence was estimated relying on diagnostic test results based on cut-off values pre-specified by the manufacturers of the tests as well as relying on mixture models applied to continuous pathogen-specific immunoglobulin G antibody titre concentrations. The age-specific seroprevalence of hepatitis A virus (HAV), based on three Belgian cross-sectional serological datasets from 1993, 2002 and 2006, was used as a comparator since individuals acquire lifelong immunity upon recovery, implying an increasing seroprevalence with age. The age group weighted overall CMV seroprevalence derived from the mixture model was 32% (95% confidence interval (CI) 31-34%) in 2002 and 31% (95% CI 30-32%) in 2006. We demonstrated that CMV epidemiology differs from the immunizing infection HAV. This was the first large-scale study of CMV and HAV serial datasets in Belgium, estimating seroprevalence specified by age and birth cohort.


Sujet(s)
Anticorps antiviraux/sang , Infections à cytomégalovirus/épidémiologie , Cytomegalovirus/immunologie , Virus de l'hépatite A/immunologie , Hépatite A/épidémiologie , Adolescent , Adulte , Répartition par âge , Sujet âgé , Belgique/épidémiologie , Enfant , Enfant d'âge préscolaire , Études transversales , Femelle , Humains , Dosage immunologique , Immunoglobuline G/sang , Nourrisson , Mâle , Adulte d'âge moyen , Études séroépidémiologiques , Jeune adulte
5.
Parasite Epidemiol Control ; 4: e00082, 2019 Feb.
Article de Anglais | MEDLINE | ID: mdl-30662967

RÉSUMÉ

The taeniosis/cysticercosis neglected zoonotic disease complex is caused by Taenia solium, and is associated with significant economic and public health impacts. This paper reviews the current knowledge on T. solium in Zambia and the control strategies already studied, covering almost 20 years of research, and explores the way forward. Studies on occurrence of porcine cysticercosis indicated very high prevalences, ranging from 15 to 34% based on detection of circulating antigens, and of 46% to 68% based on full carcass dissection in slaughter age pigs. Taeniosis prevalences have been reported to range from 6.3% to 12% based on copro-Ag-ELISA. Human cysticercosis prevalence results ranged from 5.8% to 13% based on serum Ag-ELISA, and from 34% to 39% based on sero-antibody detection. Later on, a study in people with epilepsy suggested neurocysticercosis to be the single most important cause of epilepsy in this T. solium endemic area, with 57% of the people with active epilepsy diagnosed with probable or definite neurocysticercosis. While the need to reduce the disease burden of T. solium in Zambia is obvious, the exact short and long term goals, and the strategies to achieve these goals, are not clear. We have selected the most promising control/elimination strategies from reviews and assessed these for feasibility via discussions with local stakeholders from both medical and veterinary sectors. The proposed measures were evaluated using the newly developed agent-based disease transmission model, cystiSim and optimised using Zambian demographic and disease data. As a control option, yearly porcine treatments were selected as best option, while the preferred strategy for elimination was determined to be the combination of human and porcine mass drug administration combined with porcine vaccination of all eligible people and pigs, in a schedule of six iterations of four monthly interventions. These interventions are currently being field tested, combined with education. Several other hurdles to control, such as cost and socio-political factors and the need for an improved advocacy and awareness creation are discussed.

6.
Parasit Vectors ; 10(1): 572, 2017 Nov 16.
Article de Anglais | MEDLINE | ID: mdl-29145875

RÉSUMÉ

BACKGROUND: Taenia solium is a neglected zoonotic parasite. The performances of existing tools for the diagnosis of porcine cysticercosis need further assessment, and their shortcomings call for alternatives. The objective of this study was to evaluate the performance of tongue palpation and circulating antigen detection for the detection of porcine cysticercosis in naturally infected pigs of slaughter age compared to full carcass dissections (considered the gold standard). Additionally, alternative postmortem dissection procedures were investigated. A total of 68 rural pigs of slaughter age randomly selected in the Eastern Province of Zambia were dissected. Dissections were conducted on full carcasses (or half carcass in case cysticerci were already detected in the first half), including all the organs. Total cysticercus counts, location and stages were recorded and collected cysticerci were identified morphologically and molecularly. All sera were analysed with the B158/B60 antigen detecting ELISA (Ag-ELISA). RESULTS: Key findings were the high occurrence of T. solium infected pigs (56%) and the presence of T. solium cysticerci in the livers of 26% of infected animals. More than half of the infected carcasses contained viable cysticerci. Seven carcasses had T. hydatigena cysticerci (10%), out of which five carcasses were co-infected with T. hydatigena and T. solium; two carcasses (3%) had only T. hydatigena cysticerci. Compared to full carcass dissection, the specificity of the Ag-ELISA to detect infected carcasses was estimated at 67%, the sensitivity at 68%, increasing to 90% and 100% for the detection of carcasses with one or more viable cysticerci, and more than 10 viable cysts, respectively. Tongue palpation only detected 10% of the cases, half carcass dissection 84%. Selective dissection of the diaphragm, tongue and heart or masseters can be considered, with an estimated sensitivity of 71%, increasing to 86% in carcasses with more than 10 cysticerci. CONCLUSIONS: Depending on the aim of the diagnosis, a combination of Ag-ELISA and selective dissection, including investigating the presence of T. hydatigena, can be considered. Full carcass dissection should include the dissection of the liver, kidneys, spleen and lungs, and results should be interpreted carefully, as small cysticerci can easily be overlooked.


Sujet(s)
Cysticercose/médecine vétérinaire , Maladies des porcs/diagnostic , Taenia solium/isolement et purification , Abattoirs , Animaux , Anticorps antihelminthe/sang , Antigènes d'helminthe/sang , Antigènes d'helminthe/immunologie , Cysticercose/diagnostic , Cysticercose/immunologie , Cysticercose/parasitologie , Diagnostic , Dissection , Test ELISA/méthodes , Viande/parasitologie , Palpation/méthodes , Sensibilité et spécificité , Suidae/parasitologie , Maladies des porcs/immunologie , Maladies des porcs/parasitologie , Taenia solium/immunologie , Langue/physiopathologie , Zambie/épidémiologie
7.
Vet Parasitol ; 245: 39-41, 2017 Oct 15.
Article de Anglais | MEDLINE | ID: mdl-28969835

RÉSUMÉ

Taenia solium taeniasis/cysticercosis is a zoonosis included in the WHO's list of neglected tropical diseases. Accurate diagnostic tools for humans and pigs are needed to monitor intervention outcomes. Currently used diagnostic tools for porcine cysticercosis all have drawbacks. Serological tests are mainly confronted with problems of specificity. More specifically, circulating antigen detecting tests cross-react with Taenia hydatigena and the possibility of transient antigens as a result of aborted infections is suspected. Furthermore, the hypothesis has been raised that hatched ingested eggs of other Taenia species may lead to a transient antibody response or to the presence of circulating antigen detectable by serological tests used for porcine cysticercosis. Here we describe the results of a study that consisted of oral administration of Taenia saginata eggs to five piglets followed by serological testing during five weeks and necropsy aiming at studying possible cross reactions in serological tests used for porcine cysticercosis. The infectivity of the eggs was verified by in vitro hatching and by experimental infection of a calf. One piglet developed acute respiratory disease and died on day 6 post infection. The remaining four piglets did not show any clinical signs until euthanasia. None of the serum samples from four piglets collected between days 0 and 35 post infection gave a positive reaction in the B158/B60 Ag-ELISA and in a commercial Western blot for antibody detection. In conclusion, this study showed that experimental exposure of four pigs to T. saginata eggs did not result in positive serologies for T. solium. These results may help interpreting serological results in monitoring of T. solium control programmes.


Sujet(s)
Anticorps antihelminthe/physiologie , Antigènes d'helminthe/sang , Maladies des porcs/parasitologie , Taenia solium , Taeniase/médecine vétérinaire , Animaux , Anticorps antihelminthe/sang , Bovins , Maladies des bovins/parasitologie , Suidae , Taenia saginata/immunologie , Taeniase/sang , Taeniase/diagnostic
8.
Eur J Clin Microbiol Infect Dis ; 36(11): 2029-2040, 2017 Nov.
Article de Anglais | MEDLINE | ID: mdl-28669015

RÉSUMÉ

Human cysticercosis (CC) is a parasitic zoonosis caused by the larval stage (cyst) of the Taenia solium. Cysts can establish in the human central nervous system (neurocysticercosis, NCC) and other organs and tissues; they also develop in pigs, the natural intermediate host. Human taeniosis may be caused by T. solium, Taenia saginata and Taenia asiatica tapeworms; these infections are usually asymptomatic, but show a significant relevance as they perpetuate the parasites' life cycle, and, in the case of T. solium, they are the origin of (N)CC. In European Union (EU) member states and associated countries, the occurrence of autochthonous T. solium cases is debated, and imported cases have significantly increased lately; the status of T. asiatica has been never reported, whereas T. saginata is prevalent and causes an economic impact due to condemned carcasses. Based on their effects on the EU society, the specific diagnosis of these pathologies is relevant for their prevention and control. The aims of this study were to know the diagnostic tests used in European laboratories for human taeniosis/cysticercosis by means of a questionnaire, to determine potential gaps in their detection, and to obtain preliminary data on the number of diagnosed taeniosis/CC cases.


Sujet(s)
Techniques de laboratoire clinique/méthodes , Cysticercose/diagnostic , Techniques de diagnostic moléculaire/méthodes , Animaux , Cysticercose/parasitologie , Europe , Humains , Enquêtes et questionnaires , Suidae/parasitologie , Taenia solium/embryologie
9.
Acta Trop ; 165: 252-260, 2017 Jan.
Article de Anglais | MEDLINE | ID: mdl-27140860

RÉSUMÉ

Taenia solium taeniasis/cysticercosis is a neglected parasitic zoonosis with significant economic and public health impacts. Control measures can be broadly grouped into community health education, improvements in hygiene and sanitary conditions, proper meat handling at household and community level, improved standards of meat inspection, pig management, treatment of individual patients and possibly human populations, and treatment and/or vaccination of porcine populations. This manuscript looks critically into currently existing control options and provides suggestions on which (combination of) tools would be most effective in the control of T. solium taeniasis/cysticercosis in sub-Saharan Africa. Field data and disease transmission simulations suggest that implementation of a single intervention control strategy will not lead to a satisfactory reduction of disease morbidity or transmission. A feasible strategy to combat T. solium taeniasis/cysticercosis would include a combination of approaches focussing on both human (health education and treatment) and animal host (management, treatment and vaccination), which can vary for different communities and different geographical locations. Selection of the specific strategy depends on cost-effectiveness analyses based on solid field data, currently unavailable, though urgently needed; as well as on health priorities and resources of the country. A One Health approach involving medical, veterinary, environmental and social sectors is essential for T. solium to be controlled and eventually eliminated. Finally the success of any intervention is largely dependent on the level of societal and political acceptance, commitment and engagement.


Sujet(s)
Anthelminthiques/usage thérapeutique , Cysticercose/traitement médicamenteux , Viande/parasitologie , Maladies des porcs/traitement médicamenteux , Taenia solium/effets des médicaments et des substances chimiques , Taeniase/traitement médicamenteux , Zoonoses/traitement médicamenteux , Adolescent , Adulte , Afrique subsaharienne/épidémiologie , Sujet âgé , Sujet âgé de 80 ans ou plus , Animaux , Cysticercose/épidémiologie , Cysticercose/prévention et contrôle , Femelle , Éducation pour la santé , Humains , Mâle , Adulte d'âge moyen , Santé publique , Sus scrofa/parasitologie , Suidae , Maladies des porcs/épidémiologie , Maladies des porcs/parasitologie , Maladies des porcs/prévention et contrôle , Taeniase/épidémiologie , Taeniase/prévention et contrôle , Vaccination , Jeune adulte , Zoonoses/prévention et contrôle
10.
Parasite Immunol ; 38(10): 628-34, 2016 Oct.
Article de Anglais | MEDLINE | ID: mdl-27493081

RÉSUMÉ

Neurocysticercosis (NCC), Taenia solium larval infection of the brain, is an important cause of acquired seizures in endemic countries, which relate to number, location and degenerating cysts in the brain. Multicyst infections are common in endemic countries although single-cyst infection prevails in India. Single-cyst infections in an endemic country suggest a role for host immunity limiting the infection. This study examined ex vivo CD4(+) T cells and in vitro Th1 and Th2 cytokine responses to T. solium cyst antigens of peripheral blood mononuclear cells of healthy subjects from endemic and nonendemic regions and of single- and multicyst-infected patients for association with cyst burden of NCC. T. solium cyst antigens elicited a Th1 cytokine response in healthy subjects of T. solium-endemic and T. solium-non-endemic regions and those with single-cyst infections and a Th2 cytokine response from subjects with multicyst neurocysticercosis. Multicyst neurocysticercosis subjects also exhibited low levels of effector memory CD4(+) T cells. Th1 cytokine response of T. solium exposure and low infectious loads may aid in limiting cyst number. Th2 cytokines and low effector T cells may enable multiple-cyst infections to establish and persist.


Sujet(s)
Neurocysticercose/immunologie , Taenia solium/immunologie , Animaux , Encéphale/immunologie , Cytokines/métabolisme , Femelle , Humains , Agranulocytes/immunologie , Mâle , Neurocysticercose/parasitologie , Lymphocytes auxiliaires Th1/immunologie , Lymphocytes auxiliaires Th2/immunologie
11.
Vet Parasitol ; 213(1-2): 38-45, 2015 Sep 30.
Article de Anglais | MEDLINE | ID: mdl-25837784

RÉSUMÉ

Taenia solium taeniasis/cysticercosis is a neglected zoonotic disease complex occurring primarily in developing countries. Though claimed eradicated from the European Union (EU), an increasing number of human neurocysticercosis cases is being detected. Risk factors such as human migration and movement of pigs/pork, as well as the increasing trend in pig rearing with outside access are discussed in this review. The entry of a tapeworm carrier into the EU seems a lot more plausible than the import of infected pork. The establishment of local transmission in the EU is presently very unlikely. However, considering the potential changes in risk factors, such as the increasing trend in pig farming with outdoor access, the increasing human migration from endemic areas into the EU, this situation might change, warranting the establishment of an early warning system, which should include disease notification of taeniasis/cysticercosis both in human and animal hosts. As currently human-to-human transmission is the highest risk, prevention strategies should focus on the early detection and treatment of tapeworm carriers, and should be designed in a concerted way, across the EU and across the different sectors.


Sujet(s)
Migration humaine , Taeniase/prévention et contrôle , Taeniase/transmission , Animaux , Notification des maladies , Union européenne , Humains , Surveillance de la population , Facteurs de risque , Suidae , Taenia solium , Taeniase/diagnostic
12.
Vet Parasitol ; 207(1-2): 7-16, 2015 Jan 15.
Article de Anglais | MEDLINE | ID: mdl-25499128

RÉSUMÉ

Livestock animals are a potential risk for transmission of toxoplasmosis to humans. Sheep and pigs still remain an important source because their meat is often eaten undercooked which has been regarded as a major route of infection in many countries. Moreover, porcine tissues are processed in many food products. In the current study, the IFN-gamma (T-helper 1 cells), IL-4 (Th2 cells) and IL-10 mRNA (Treg cells) expression by blood mononuclear cells, and the serum antibody response against Toxoplasma gondii total lysate antigen, recombinant T. gondii GRA1, rGRA7, rMIC3 and rEC2, a chimeric antigen composed of MIC2, MIC3 and SAG1, was studied in sheep the first two months after a T. gondii infection and compared with these responses in pigs. At the end of this period, the parasite distribution in heart, brain and two skeletal muscles in sheep was compared with this in pigs. Whereas the parasite distribution was similar in sheep and pigs, the antibody response differed considerably. In sheep, antibodies appeared against all tested T. gondii antigens, but mainly against rGRA7, rMIC3234307 and TLA whereas in pigs only rGRA7-specific antibodies could be demonstrated. Also, the cytokine response differed. Both in sheep and pigs an IFN-gamma response occurred which seemed to be a slightly more pronounced in sheep. In sheep, also IL-10 and IL-4 mRNA expression showed an increase, but later than IFN-gamma and with more variation. However, in pigs no such increase was seen. As concerning diagnosis, results indicate that serum antibodies against GRA7 in live sheep and pigs and heart tissue for bioassay and qPCR in slaughtered animals are the best targets to demonstrate presence of T. gondii infection.


Sujet(s)
Anticorps antiprotozoaires/sang , Interféron gamma/génétique , Maladies des ovins/immunologie , Maladies des porcs/immunologie , Toxoplasma/immunologie , Toxoplasmose animale/immunologie , Animaux , Antigènes de protozoaire/immunologie , Encéphale/parasitologie , Cytokines/génétique , Cytokines/métabolisme , Coeur/parasitologie , Interféron gamma/métabolisme , Interleukine-10/génétique , Interleukine-10/métabolisme , Muscles squelettiques/parasitologie , Protéines de protozoaire/immunologie , Protéines recombinantes , Ovis , Maladies des ovins/parasitologie , Suidae , Maladies des porcs/parasitologie , Toxoplasmose animale/parasitologie
14.
Vet Parasitol ; 205(1-2): 375-8, 2014 Sep 15.
Article de Anglais | MEDLINE | ID: mdl-25090953

RÉSUMÉ

Taenia spp. have an indirect life cycle, cycling between a definitive and an intermediate host with zoonotic species causing public health problems in many developing countries. During the course of 2 separate surveys in Zambia (2004 and 2009), the presence of Taenia larval stages (cysticerci) was examined in Kafue lechwe (Kobus leche kafuensis), Black lechwe (Kobus leche smithermani) and other wildlife species from the Kafue and Bangweulu flood plains. Examinations involved post-mortem inspection and serum specific antigen detection. The recovered cysts from seven carcasses were characterised using PCR and DNA sequence analysis. The overall proportion of infection in wildlife on post-mortem examination was 19.0% (95% CI: 9.1-29.0%). The proportion of infected wildlife based on post-mortem examinations in the Kafue flood plains was estimated at 28.6% (95% CI: 13.3-43.9%), while the seroprevalence was estimated at 25.0% (95% CI: 2.9-47.1%). The seroprevalence for cattle in the Kafue flood plains was estimated at 61.5% (95% CI: 42.0-81.0%) while that of Kafue lechwe in the same ecosystem was estimated at 66.6% (95% CI: 45.6-85.7%). Infection rates were higher in Kafue lechwe than in Black lechwe suggesting differences in the exposure patterns. The sequencing results indicated that none of the recovered cysts were either Taenia solium or Taenia saginata. We therefore conclude they most likely belong to a less studied (wildlife) Taenia species that requires further characterisation.


Sujet(s)
Antilopes/parasitologie , Maladies des bovins/épidémiologie , Taenia/isolement et purification , Taeniase/médecine vétérinaire , Animaux , Bovins , Maladies des bovins/parasitologie , Écosystème , Femelle , Mâle , Analyse de séquence d'ADN/médecine vétérinaire , Taenia/génétique , Taeniase/épidémiologie , Taeniase/parasitologie , Zones humides , Zambie/épidémiologie
15.
Vet Parasitol ; 205(1-2): 57-61, 2014 Sep 15.
Article de Anglais | MEDLINE | ID: mdl-25065982

RÉSUMÉ

Even though infected sheep are a potential source of Toxoplasma gondii infection in humans, information is lacking concerning the seroprevalence of T. gondii infection in sheep in Belgium. We examined 3170 serum samples for anti-Toxoplasma IgG in sheep by total lysate antigen (TLA) enzyme-linked immunosorbent assay (ELISA). IgG to T. gondii was demonstrated in 87.4% of the tested sheep and in 96.2% of the 209 tested flocks. The seroprevalences in Antwerp (65.2%) and Wallonia (68.6%) are statistically lower than in the other regions in Belgium (96.7-97.8%) (P<0.05). The present study is the first report that analyzed the prevalence of T. gondii infection in sheep in Belgium and confirms the high prevalence of Toxoplasma-specific IgG antibodies in the sheep population.


Sujet(s)
Maladies des ovins/parasitologie , Toxoplasma , Toxoplasmose animale/épidémiologie , Animaux , Anticorps antiprotozoaires/sang , Belgique/épidémiologie , Immunoglobuline G/sang , Études séroépidémiologiques , Ovis , Maladies des ovins/épidémiologie
16.
J Helminthol ; 88(4): 441-6, 2014 Dec.
Article de Anglais | MEDLINE | ID: mdl-23721954

RÉSUMÉ

Flukes were found in the bile ducts of domestic ducks (Anas platyrhynchos), necropsied in the Binh Dinh province of Central Vietnam. Following staining, morphological characteristics of the bird flukes were compatible with Opisthorchis viverrini, although some characteristics differed from those described in specimens collected from mammal hosts. Computation of the phylogenetic trees on the partial sequences of the second internal ribosomal spacer (ITS2) of the ribosomal DNA and cytochrome c oxidase subunit I (COI) markers of the mitochondrial DNA showed close similarity of the 'bird' Opisthorchis sp. with O. viverrini. We speculate that these bird flukes are O. viverrini that show intraspecies morphological and molecular variability compared to isolates from mammals. This demonstrates the complex epidemiological situation of opisthorchiasis in Vietnam and urges investigations on the potential of birds as a reservoir host of this zoonotic fluke.


Sujet(s)
ADN mitochondrial/génétique , ADN ribosomique/génétique , Canards , Opisthorchiase/médecine vétérinaire , Opisthorchis/génétique , Maladies de la volaille/parasitologie , Animaux , Espaceur de l'ADN ribosomique/génétique , Opisthorchiase/épidémiologie , Opisthorchiase/parasitologie , Opisthorchis/anatomie et histologie , Opisthorchis/classification , Opisthorchis/isolement et purification , Phylogenèse , Maladies de la volaille/épidémiologie , Vietnam/épidémiologie
17.
Vet Parasitol ; 200(1-2): 207-11, 2014 Feb 24.
Article de Anglais | MEDLINE | ID: mdl-24360291

RÉSUMÉ

Trichinellosis is an emerging parasitic zoonosis in North Vietnam. In this survey, hunted and farm-bred wild boars as well as synanthropic rats were sampled in two provinces of northwest Vietnam where outbreaks of trichinellosis have recently occurred. Evidence of Trichinella infection was studied by parasitological, serological and molecular methods. The results showed relatively low prevalence of Trichinella spiralis in hunted wild boars (2/62 (3.2%; 95% CI: 0.8- 4.8)) and rats (23/820 (2.8%; 95% CI: 13.7-32.3)). Parasite burdens in the muscle tissues were between 0.1 and 0.03 larvae/g, and 0.1 and 7 larvae/g in wild boars and rats, respectively. Seroprevalence in farm-bred wild boars was negative. The findings of Trichinella-infected rats in 7 of the 20 districts of Dien Bien and Son La provinces suggest that the parasite is circulating in these regions. These results indicate that the local population and health centers should be made aware of the risks of eating raw or undercooked meat dishes prepared from wild animals.


Sujet(s)
Maladies des rongeurs/épidémiologie , Sus scrofa , Maladies des porcs/épidémiologie , Trichinellose/épidémiologie , Animaux , Anticorps antihelminthe/sang , Test ELISA , Femelle , Mâle , Muscles/parasitologie , Charge parasitaire , Réaction de polymérisation en chaîne , Prévalence , Rats , Maladies des rongeurs/parasitologie , Suidae , Maladies des porcs/parasitologie , Trichinella/génétique , Trichinella/immunologie , Trichinellose/parasitologie , Vietnam/épidémiologie
18.
J Nepal Health Res Counc ; 11(24): 221-4, 2013 May.
Article de Anglais | MEDLINE | ID: mdl-24362617

RÉSUMÉ

The burden of disease, most commonly expressed in terms of Disability-Adjusted Life Years, has become a crucial component in decision making processes within the health sector. In Nepal, however, burden of disease estimates are scarce and lack representativeness. To improve our understanding of the burden of disease in Nepal and thereby increase the efficiency of health policies, there is an urgent need to strengthen the local evidence base. All relevant stakeholders should therefore collaborate to generate new data, improve existing data generation mechanisms, make generated data available, and optimize the use of available data.


Sujet(s)
Coûts indirects de la maladie , Connaissances, attitudes et pratiques en santé , Recherche , Personnes handicapées , Humains , Népal
19.
Int J Parasitol ; 43(10): 853-9, 2013 Sep.
Article de Anglais | MEDLINE | ID: mdl-23831108

RÉSUMÉ

The diagnostic values of seven serological tests (ELISAs) and of the obligatory European Union-approved routine visual meat inspection for the detection of Taenia saginata cysticercosis were investigated. A total of 793 slaughtered dairy cows were selected in three European Union approved abattoirs in Switzerland, an endemic area (apparent prevalence by enhanced meat inspection up to 4.5%) with typically low parasite burdens. ELISAs based on a somatic larval antigen, isoelectric focused somatic larval antigen, larval excretory/secretory antigens, peptide HP6-2, peptide Ts45S-10, pooled peptide solution and a monoclonal antibody antigen capture assay were initially screened. As there is no perfect diagnostic 'gold standard' reference test, the obligatory meat inspection and four selected serological tests were further analysed using Bayesian inference to estimate the "true" prevalence and the diagnostic test sensitivities and specificities. The ELISA for specific antibody detection based on excretory/secretory antigens showed highest sensitivity and specificity with 81.6% (95% credible interval: 70-92) and 96.3% (95% credible interval: 94-99), respectively. The Bayesian model estimated the specificity of the ELISA, based on the synthetic peptide Ts45S-10 as 55.2% (95% credible interval: 46-65) and sensitivity as 84.7% (95% credible interval: 82-88). The sensitivity of the ELISA based on mAbs, detecting circulating antigen, was 14.3% (95% credible interval: 9-23) with a specificity of 93.7% (95% credible interval: 92-96). The diagnostic sensitivity of the obligatory standard European Union meat inspection procedure for the detection of T. saginata cysticercus infection at the abattoir was estimated to be 15.6% (95% credible interval: 10-23). Based on these data, the modelled prevalence of cysticercosis in dairy cows presented at abattoirs in Switzerland was estimated to be 16.5% (95% credible interval: 13-21). These cattle also had a high prevalence of infection with Dicrocoelium dendriticum (60.8%) and Fasciola hepatica (13.5%).


Sujet(s)
Maladies des bovins/diagnostic , Maladies des bovins/parasitologie , Cysticercose/médecine vétérinaire , Parasitologie/méthodes , Taenia saginata/isolement et purification , Médecine vétérinaire/méthodes , Animaux , Bovins , Cysticercose/diagnostic , Cysticercose/parasitologie , Test ELISA/méthodes , Contrôle des aliments/méthodes , Sensibilité et spécificité , Suisse
20.
Trans R Soc Trop Med Hyg ; 107(1): 62-4, 2013 Jan.
Article de Anglais | MEDLINE | ID: mdl-23296699

RÉSUMÉ

BACKGROUND: Porcine cysticercosis is acquired by pigs through consumption of human faeces containing Taenia solium ova and indicates the presence of active transmission of the parasite between pigs and humans. METHODS: The prevalence of porcine cysticercosis was assessed by an antigen ELISA and enzyme linked immunoelectrotransfer blot (EITB) for antibodies in rural and urban areas of southern India. RESULTS: Of the 112 porcine blood samples, 13 (11.6%) were positive for cysticercal antigens and the free-range pigs were 3.6 times more likely to be infected than the slaughtered pigs and 67 (59.8 %) tested positive for serum antibodies indicating high exposure to T. solium eggs. CONCLUSION: The high prevalence of porcine cysticercosis recorded in the study areas mandates public health measures, which includes meat inspection.


Sujet(s)
Cysticercose/épidémiologie , Maladies des porcs/épidémiologie , Animaux , Anticorps antihelminthe/sang , Antigènes d'helminthe/sang , Test ELISA , Inde/épidémiologie , Prévalence , Suidae
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