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Importance of Wetlands Management for West Nile Virus Circulation Risk, Camargue, Southern France

Author

Listed:
  • Sophie Pradier

    (INRA, UR346 Epidémiologie Animale, Saint Genès Champanelle F-63122, France
    INRA, UMR1225, IHAP, Université de Toulouse, INP-ENVT, Toulouse F-31076, France)

  • Alain Sandoz

    (Centre de Recherche pour la Conservation des Zones Humides Méditerranéennes, Fondation Tour du Valat, Arles F-13200, France
    UFR Sciences, Aix-Marseille Université, Marseille F-13003, France)

  • Mathilde C. Paul

    (INRA, UMR1225, IHAP, Université de Toulouse, INP-ENVT, Toulouse F-31076, France)

  • Gaëtan Lefebvre

    (Centre de Recherche pour la Conservation des Zones Humides Méditerranéennes, Fondation Tour du Valat, Arles F-13200, France)

  • Annelise Tran

    (CIRAD, UPR Animal et Gestion Intégrée des Risques (AGIRs), Montpellier F-34398, France
    CIRAD, UMR Territoires Environnement Télédétection et Information Spatiale (TETIS), Montpellier F-34398, France)

  • Josiane Maingault

    (ANSES, Maisons-Alfort Laboratory for Animal Health, UMR1161 Virologie, INRA, ANSES, ENVA, Maisons-Alfort F-94703, France)

  • Sylvie Lecollinet

    (ANSES, Maisons-Alfort Laboratory for Animal Health, UMR1161 Virologie, INRA, ANSES, ENVA, Maisons-Alfort F-94703, France)

  • Agnès Leblond

    (INRA, UR346 Epidémiologie Animale, Saint Genès Champanelle F-63122, France
    Equine Department, Vetagrosup, Marcy L'Etoile F-69280, 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.

Suggested Citation

  • Sophie Pradier & Alain Sandoz & Mathilde C. Paul & Gaëtan Lefebvre & Annelise Tran & Josiane Maingault & Sylvie Lecollinet & Agnès Leblond, 2014. "Importance of Wetlands Management for West Nile Virus Circulation Risk, Camargue, Southern France," IJERPH, MDPI, vol. 11(8), pages 1-15, August.
    • Handle: RePEc:gam:jijerp:v:11:y:2014:i:8:p:7740-7754:d:38785
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    Cited by:

    1. Anna Yusa & Peter Berry & June J.Cheng & Nicholas Ogden & Barrie Bonsal & Ronald Stewart & Ruth Waldick, 2015. "Climate Change, Drought and Human Health in Canada," IJERPH, MDPI, vol. 12(7), pages 1-54, July.

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