Use of sentinel chickens to study the transmission dynamics of West Nile virus in a sahelian ecosystem

During the 2003 rainy season, a follow-up survey in sentinel chickens was undertaken to assess the seasonal transmission of West Nile virus (WNV) in a sahelian ecosystem: the Ferlo (Senegal). The estimated incidence rate in chickens was 14% (95% CI 7–29), with a very low level of transmission betwee...

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Bibliographic Details
Published in:Epidemiology and infection 2008-04, Vol.136 (4), p.525-528
Main Authors: CHEVALIER, V., LANCELOT, R., DIAÏTE, A., MONDET, B., De LAMBALLERIE, X.
Format: Article
Language:English
Subjects:
Aedes - virology
Animals
Biological and medical sciences
Chickens - virology
Culex - virology
Ecosystem
Fundamental and applied biological sciences. Psychology
Horses
Humans
Insect Vectors - virology
Microbiology
Miscellaneous
Mortality
Mosquitoes
Poultry
Rain
Seasons
Senegal - epidemiology
Sentinel Surveillance
Short Report
Virology
West Nile Fever - epidemiology
West Nile Fever - prevention & control
West Nile Fever - transmission
West Nile virus - isolation & purification
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Summary:During the 2003 rainy season, a follow-up survey in sentinel chickens was undertaken to assess the seasonal transmission of West Nile virus (WNV) in a sahelian ecosystem: the Ferlo (Senegal). The estimated incidence rate in chickens was 14% (95% CI 7–29), with a very low level of transmission between July and September, and a transmission peak occurring between September and October. Comparing these results with the estimate obtained from a previous transversal serological study performed on horses the same year in the same area, the relevance of sentinel chickens in estimating the WNV transmission rate is highlighted. Conventionally adult mosquito populations disappear during the dry season but WN disease was shown to be endemic in the study area. The mechanisms of virus maintenance are discussed.
ISSN:0950-2688
1469-4409
DOI:10.1017/S0950268807008801