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Oiseaux sauvages et virus West Nile : étude éco-épidémiologique en Camargue

Elsa Jourdain 1
TIMC - Techniques de l'Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications, Grenoble - UMR 5525, Station Biologique de la Tour du Valat, UBIVE - Biologie des Infections Virales Émergentes - Biology of Emerging Viral Infections
Abstract : The work presented here deals with the role of wild birds in West Nile (WN) virus epidemiology in the Camargue. Bird species likely to be involved in the various steps of WN virus circulation (introduction, amplification, spread, emergence) are identified using bibliographic data on WN disease and ornithological criteria. Epidemiological investigations focused on some of these species during the years 2004 (epizootic year) and 2005 (post-epizootic year) show that WN virus is circulating in the Camargue bird population. Dates and locations of these contacts are unknown for migrating birds arriving from Africa in spring. Conversely, in sedentary birds, two isolates of a single strain were obtained in 2004, from the brain of a Common magpie Pica pica and a House sparrow Passer domesticus, respectively. They were totally sequenced. Phylogenetic analysis of this strain shows that it belongs to the same cluster as the other strains previously isolated in Mediterranean Europe. Serological and virological results in these two bird species, which are often seen in close proximity with horse farms, suggest that they are good candidates for WN virus amplification and emergence in horses. This hypothesis is also supported by the fact that viral RNA was found in the feces of a Common magpie in 2005. Investigations have to be pursued to assess how the various Camargue bird species are involved, respectively, in WN virus circulation. Other approaches should be used, like blood meal analysis of mosquito vectors, which were recently identified.
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Contributor : Elsa Jourdain <>
Submitted on : Monday, April 30, 2007 - 5:13:24 PM
Last modification on : Thursday, May 6, 2021 - 8:58:03 AM
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  • HAL Id : tel-00144110, version 1


Elsa Jourdain. Oiseaux sauvages et virus West Nile : étude éco-épidémiologique en Camargue. Ecologie, Environnement. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00144110⟩



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