Transmission of foot and mouth disease at the wildlife/livestock interface of the Kruger National Park, South Africa: can the risk be mitigated?

Jori Ferran, Etter Eric. 2016. Transmission of foot and mouth disease at the wildlife/livestock interface of the Kruger National Park, South Africa: can the risk be mitigated?. Preventive Veterinary Medicine, 126 : 19-29.

Quartile : Q1, Sujet : VETERINARY SCIENCES

Résumé : In Southern Africa, the African buffalo (Syncerus caffer) is the natural reservoir of foot and mouth disease (FMD). Contacts between this species and cattle are responsible for most of the FMD outbreaks in cattle at the edge of protected areas, which generate huge economic losses. During the late 1980's and 90's, the erection of veterinary cordon fences and the regular vaccination of cattle exposed to buffalo contact at the interface of the Kruger National Park (KNP), proved to be efficient to control and prevent FMD outbreaks in South Africa. However, since 2000, the efficiency of those measures has deteriorated, resulting in an increased rate of FMD outbreaks in cattle outside KNP, currently occurring more than once a year. Based on retrospective ecological and epidemiological data, we developed a stochastic quantitative model to assess the annual risk of FMD virus (FMDV) transmission from buffalo to cattle herds present at the KNP interface. The model suggests that good immunization of approximately 75% of the cattle population combined with a reduction of buffalo/cattle contacts is an efficient combination to reduce FMDV transmission to one infective event every 5.5 years, emulating the epidemiological situation observed at the end of the 20th century, before current failure of control measures. The model also indicates that an increasing number of buffalo present in the KNP and crossing its boundaries, combined with a reduction in the vaccination coverage of cattle herds at the interface, increases 3-fold the risk of transmission (one infective event per year).The model proposed makes biological sense and provides a good representation of current knowledge of FMD ecology and epidemiology in Southern Africa which can be used to discuss with stakeholders on different management options to control FMD at the wildlife livestock interface and updated if new information becomes available. It also suggests that the control of FMD at the KNP interface is becoming increasingly challenging and will probably require alternative approaches to control this disease and its economic impact.

Mots-clés Agrovoc : virus fièvre aphteuse, transmission des maladies, animal domestique, animal sauvage, gestion du risque, modèle de simulation, modèle mathématique, interactions biologiques, buffle africain, bétail, épidémiologie, contrôle de maladies, fièvre aphteuse, zone protégée

Mots-clés géographiques Agrovoc : Afrique du Sud

Mots-clés libres : African buffalo, Foot and mouth disease, Transmission, Risk assessment, Modeling, Kruger National Park

Classification Agris : L73 - Maladies des animaux
P01 - Conservation de la nature et ressources foncières
U10 - Informatique, mathématiques et statistiques

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

Auteurs et affiliations

• Jori Ferran, CIRAD-ES-UPR AGIRs (BWA) ORCID: 0000-0001-5451-7767
• Etter Eric, CIRAD-ES-UPR AGIRs (ZAF) ORCID: 0000-0002-6438-7828

Source : Cirad-Agritrop (https://agritrop.cirad.fr/579414/)

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