Low west nile virus circulation in wild birds in an area of recurring outbreaks in Southern France
West Nile virus (WNV) has a history of irregular but recurrent epizootics in countries of Mediterranean and of Central and Eastern Europe. We have investigated the temporal enzootic activity of WNV in free-ranging birds over a 3-year period in an area with sporadic occurrences of WNV outbreaks in Southern France. We conducted an intensive serologic survey on several wild bird populations (>4000 serum samples collected from 3300 birds) selected as potential indicators of the WNV circulation. WNV antibodies were detected by seroneutralization and=or plaque reduction neutralization in house sparrows, black-billed magpies, and scops owls, but these species appeared to be insufficient indicators of WNV circulation. Overall seroprevalence was low (<1%), including in birds that had been potentially exposed to the virus during recent outbreaks. However, the detection of a seroconversion in one bird, as well as the detection of seropositive birds in all years of our monitoring, including juveniles, indicate a constant annual circulation of WNV at a low level, including in years without any detectable emergence of WN fever in horses or humans.
| Main Authors: | , , , , , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | L73 - Maladies des animaux, L72 - Organismes nuisibles des animaux, oiseau, vecteur de maladie, flavivirus, sérologie, animal sauvage, distribution des populations, surveillance épidémiologique, épidémiologie, http://aims.fao.org/aos/agrovoc/c_935, http://aims.fao.org/aos/agrovoc/c_8164, http://aims.fao.org/aos/agrovoc/c_2963, http://aims.fao.org/aos/agrovoc/c_27081, http://aims.fao.org/aos/agrovoc/c_24103, http://aims.fao.org/aos/agrovoc/c_6113, http://aims.fao.org/aos/agrovoc/c_16411, http://aims.fao.org/aos/agrovoc/c_2615, http://aims.fao.org/aos/agrovoc/c_3081, http://aims.fao.org/aos/agrovoc/c_4698, |
| Online Access: | http://agritrop.cirad.fr/554552/ http://agritrop.cirad.fr/554552/1/document_554552.pdf |
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