An integrative eco-epidemiological analysis of West Nile virus transmission

Tran Annelise, L'Ambert Grégory, Balança Gilles, Pradier Sophie, Grosbois Vladimir, Balenghien Thomas, Baldet Thierry, Lecollinet Sylvie, Leblond Agnès, Gaidet-Drapier Nicolas. 2017. An integrative eco-epidemiological analysis of West Nile virus transmission. Ecohealth, 14 (3) : pp. 474-489.

Journal article ; Article de revue à facteur d'impact
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Abstract : West Nile disease, caused by the West Nile virus (WNV), is a mosquito-borne zoonotic disease affecting humans and horses that involves wild birds as amplifying hosts. The mechanisms of WNV transmission remain unclear in Europe where the occurrence of outbreaks has dramatically increased in recent years. We used a dataset on the competence, distribution, abundance, diversity and dispersal of wild bird hosts and mosquito vectors to test alternative hypotheses concerning the transmission of WNV in Southern France. We modelled the successive processes of introduction, amplification, dispersal and spillover of WNV to incidental hosts based on host–vector contact rates on various land cover types and over four seasons. We evaluated the relative importance of the mechanisms tested using two independent serological datasets of WNV antibodies collected in wild birds and horses. We found that the same transmission processes (seasonal virus introduction by migratory birds, Culex modestus mosquitoes as amplifying vectors, heterogeneity in avian host competence, absence of 'dilution effect') best explain the spatial variations in WNV seroprevalence in the two serological datasets. Our results provide new insights on the pathways of WNV introduction, amplification and spillover and the contribution of bird and mosquito species to WNV transmission in Southern France. (Résumé d'auteur)

Mots-clés Agrovoc : Épidémiologie, Flavivirus, Transmission des maladies, Hôte, Oiseau, Culicidae, Distribution spatiale, Écologie animale, Sérologie, Système d'information géographique, Dynamique des populations, Modèle de simulation, Modèle mathématique, Gestion du risque, Cheval, Animal sauvage, Migration animale

Mots-clés géographiques Agrovoc : Languedoc-Roussillon, Région méditerranéenne

Mots-clés complémentaires : Fièvre du Nil occidental

Classification Agris : L73 - Animal diseases
L72 - Pests of animals

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Agence(s) de financement européenne(s) : European Commission

Programme de financement européen : FP6

Projet(s) de financement européen(s) : Emerging Diseases in a changing European Environnement

Auteurs et affiliations

  • Tran Annelise, CIRAD-BIOS-UMR ASTRE (REU) ORCID: 0000-0001-5463-332X
  • L'Ambert Grégory, EID (FRA)
  • Balança Gilles, CIRAD-BIOS-UMR ASTRE (FRA)
  • Pradier Sophie, ENVT (FRA)
  • Grosbois Vladimir, CIRAD-BIOS-UMR ASTRE (FRA)
  • Balenghien Thomas, CIRAD-BIOS-UMR ASTRE (MAR)
  • Baldet Thierry, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0003-2979-9517
  • Lecollinet Sylvie, ANSES (FRA)
  • Leblond Agnès, INRA (FRA)
  • Gaidet-Drapier Nicolas, CIRAD-BIOS-UMR ASTRE (FRA)

Source : Cirad-Agritrop (

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