Desquesnes M., Bossard G., Thevenon S., Patrel Delphine, Ravel Sophie, Pavlovic Djamila, Herder Stéphane, Patout O., Lepetitcolin E., Hollzmuller P., Berthier D., Jacquiet P., Cuny Gérard. (2009). Development and application of an antibody-ELISA to follow up a Trypanosoma evansi outbreak in a dromedary camel herd in France. Veterinary Parasitology, 162 (3-4), p. 214-220. ISSN 0304-4017.
Titre du document
Development and application of an antibody-ELISA to follow up a Trypanosoma evansi outbreak in a dromedary camel herd in France
Année de publication
2009
Auteurs
Desquesnes M., Bossard G., Thevenon S., Patrel Delphine, Ravel Sophie, Pavlovic Djamila, Herder Stéphane, Patout O., Lepetitcolin E., Hollzmuller P., Berthier D., Jacquiet P., Cuny Gérard
Source
Veterinary Parasitology, 2009,
162 (3-4), p. 214-220 ISSN 0304-4017
An outbreak of trypanosomosis was observed for the first time in metropolitan France in October 2006, when five camels were proved to be infected by Trypanosoma evansi using parasitological methods. The parasite was isolated and used to produce a soluble antigen for antibody-enzyme linked immunosorbent assay (ELISA) in a protocol derived from a method previously developed for sheep and humans but using protein A conjugate. The animals were treated on three instances, alternatively with melarsomine hydrochloride and quinapyramine and followed up on a monthly basis for 2 years with various diagnostic techniques including parasitological, serological and DNA-based methods. Initially, five animals were detected as being positive using ELISA with 83.3% concordance to parasitological tests. Immediately after the first treatment, parasites and DNA disappeared in all animals; antibody levels decreased regularly until ELISA became negative 3-4 months later. Ten months after the first treatment, parasites and antibodies were detected again in one of the camels previously found to be infected. A retrospective study indicated that the weight of this animal had been underestimated; consequently, it had received underdosages of both trypanocides. However, since hypotheses of re-infection or relapse could not be fully substantiated, it is not known whether the ELISA results for this animal were true- or false-negative over a 7-month period. The study confirmed the value of this ELISA using protein A conjugate to detect antibodies directed against T. evansi in camels and the need to use several diagnostic techniques to optimize detection of infected animals. A warning is raised on surra, a potentially emerging disease in Europe.
Plan de classement
Entomologie médicale / Parasitologie / Virologie [052]
;
Sciences du monde animal [080]
Localisation
Fonds IRD [F B010046146]
Identifiant IRD
fdi:010046146
