title: Importance of wetlands management for West Nile Virus circulation risk, Camargue, Southern France.
abstract: To assess environmental and horse-level risk factors associated with West Nile Virus (WNV) circulation in Camargue, Southern France, a serosurvey was conducted on non-vaccinated horses (n = 1159 from 134 stables) in 2007 and 2008. Fifteen Landsat images were examined to quantify areas with open water and flooded vegetation around sampled horses. Mean percentages of areas of open water and flooded vegetation, as well as variations in these percentages between 3 periods (November to February = NOT, March to July = END and August to October = EPI), were calculated for buffers of 2 km radius around the stables. Results of the final logistic regression showed that the risk of WNV seropositivity in horses decreased with their date of acquisition and age. Results also demonstrated the significant role of environmental variables. Horse serological status was associated with variations of open water areas between the NOT (November to February) and END (March to July) periods, as well as between END and EPI (August to October). WNV spillover was found more intense in areas where water level decreased strongly from winter to spring and from spring to summer.
authors.affiliation: INRA, UR346 Epidémiologie Animale, Saint Genès Champanelle F-63122, France. s.pradier@envt.fr.
authors.forename: Sophie
authors.initials: S
authors.lastname: Pradier
authors.affiliation: Centre de Recherche pour la Conservation des Zones Humides Méditerranéennes, Fondation Tour du Valat, Arles F-13200, France. alain.sandoz@univ-amu.fr.
authors.forename: Alain
authors.initials: A
authors.lastname: Sandoz
authors.affiliation: INRA, UMR1225, IHAP, Université de Toulouse, INP-ENVT, Toulouse F-31076, France. m.paul@envt.fr.
authors.forename: Mathilde C
authors.initials: MC
authors.lastname: Paul
authors.affiliation: Centre de Recherche pour la Conservation des Zones Humides Méditerranéennes, Fondation Tour du Valat, Arles F-13200, France. lefebvre@tourduvalat.org.
authors.forename: Gaëtan
authors.initials: G
authors.lastname: Lefebvre
authors.affiliation: CIRAD, UPR Animal et Gestion Intégrée des Risques (AGIRs), Montpellier F-34398, France. annelise.tran@cirad.fr.
authors.forename: Annelise
authors.initials: A
authors.lastname: Tran
authors.affiliation: ANSES, Maisons-Alfort Laboratory for Animal Health, UMR1161 Virologie, INRA, ANSES, ENVA, Maisons-Alfort F-94703, France. josiane.maingault@anses.fr.
authors.forename: Josiane
authors.initials: J
authors.lastname: Maingault
authors.affiliation: ANSES, Maisons-Alfort Laboratory for Animal Health, UMR1161 Virologie, INRA, ANSES, ENVA, Maisons-Alfort F-94703, France. slecollinet@vet-alfort.fr.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Lecollinet
authors.affiliation: INRA, UR346 Epidémiologie Animale, Saint Genès Champanelle F-63122, France. agnes.leblond@vetagro-sup.fr.
authors.forename: Agnès
authors.initials: A
authors.lastname: Leblond
mesh_terms: D000367:Age Factors; D000818:Animals; D003246:Conservation of Energy Resources; D005260:Female; D005602:France / Q000453:epidemiology; D006734:Horse Diseases / Q000453:epidemiology* / Q000517:prevention & control* / Q000821:virology; D006736:Horses; D016015:Logistic Models; D008297:Male; D015995:Prevalence; D012307:Risk Factors; D012621:Seasons; D016036:Seroepidemiologic Studies; D014901:West Nile Fever / Q000453:epidemiology / Q000517:prevention & control / Q000662:veterinary* / Q000821:virology; D014902:West Nile virus / Q000502:physiology; D053833:Wetlands
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