Environmental risk factors of West Nile virus infection of horses in the Senegal River basin

Chevalier Véronique, Dupressoir A., Tran Annelise, Diop O.M., Gottland C., Diallo M., Etter Eric, Ndiaye M., Grosbois Vladimir, Dia M., Gaidet Nicolas, Sall A.A., Soti Valérie, Niang M.. 2010. Environmental risk factors of West Nile virus infection of horses in the Senegal River basin. Epidemiology and Infection, 138 (11) : pp. 1601-1609.

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Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Abstract : In 2005, a serological study was carried out on horses in five ecologically contrasted zones of the Senegal River basin (Senegal) to assess West Nile virus (WNV) transmission and investigate underlying environmental risk factors. In each study zone, horses were randomly selected and blood samples taken. A land-cover map of the five study areas was built using two satellite ETM+ images. Blood samples were screened by ELISA for anti-WNV IgM and IgG and positive samples were confirmed by seroneutralization. Environmental data were analysed using a principal components analysis. The overall IgG seroprevalence rate was 85% (n=367; 95% CI 0.81-0.89). The proximity to sea water, flooded banks and salted mudflats were identified as protective factors. These environmental components are unfavourable to the presence of Culex mosquitoes suggesting that in Senegal, the distribution of the vector species is more limiting for WNV transmission than for the hosts' distribution. (Résumé d'auteur)

Mots-clés Agrovoc : Flavivirus, Cheval, Épidémiologie, Transmission des maladies, Système d'information géographique, Distribution géographique, Dynamique des populations, Évaluation du risque, Sérologie, Facteur du milieu, Vecteur de maladie, Oiseau

Mots-clés géographiques Agrovoc : Sénégal

Mots-clés complémentaires : Fièvre du Nil occidental

Classification Agris : L73 - Animal diseases
U30 - Research methods

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

  • Chevalier Véronique, CIRAD-ES-UPR AGIRs (FRA)
  • Dupressoir A., Institut Pasteur de Dakar (SEN)
  • Tran Annelise, CIRAD-ES-UPR AGIRs (FRA) ORCID: 0000-0001-5463-332X
  • Diop O.M., Institut Pasteur de Dakar (SEN)
  • Gottland C.
  • Diallo M., Institut Pasteur de Dakar (SEN)
  • Etter Eric, CIRAD-ES-UPR AGIRs (ZWE)
  • Ndiaye M., Institut Pasteur de Dakar (SEN)
  • Grosbois Vladimir, CIRAD-ES-UPR AGIRs (FRA)
  • Dia M., Institut Pasteur de Dakar (SEN)
  • Gaidet Nicolas, CIRAD-ES-UPR AGIRs (FRA)
  • Sall A.A., Institut Pasteur de Dakar (SEN)
  • Soti Valérie, CIRAD-ES-UPR AGIRs (FRA)
  • Niang M., Institut Pasteur de Dakar (SEN)

Source : Cirad - Agritrop (

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