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Cirad

Use of entomology surveillance data for Culicoides abundance modeling in mainland France

Villard P., Munoz F., Balenghien T., Baldet T., Lancelot R., Hénaux V.. 2018. Montpellier : CIRAD, 1 p.. InnovSur 2018, 2018-05-16/2018-05-18, Montpellier (France).

In France, Culicoides surveillance was implemented in 2002 [1] in specific areas (Corsica and Mediterranean coastal mainland) and in the whole metropolitan France from 2009 to monitor vectors activity during the bluetongue epizootics. The Directorate for food of the French Agriculture ministry (DGAL) mandated the French Agricultural Research Centre for International Development (CIRAD) to achieve this entomological surveillance. The national-scale surveillance program ceased in 2012 and was implemented again following the re-emergence of bluetongue in 2015 [2]. Since November 2016, surveillance in mainland France is implemented in 24 eco-climatic zones which are homogenous in terms of vector phenology (start and end of activity period), abundance and diversity [3, 4]. The purpose of this study was to measure the effect of several factors influencing the abundance of Culicoides for every eco-climatic zone. We applied a specific count model to measure the impact of several factors associated to the Culicoides abundance for every eco-climatic zone from the second week of 2009 to the last week of 2012. As explanatory variables we use the week number, the catch site and the year of trapping. The environmental component was considered through the eco-climatic zoning of mainland [3, 4]. Overall, the results fit the data for the 24 eco-climatic zones. They showed that the abundance of Culicoides in mainland France clearly depend on the areas with different shape of dynamics (one or two peaks, with or without plateaus). Even if our data were not collected with this goal, our study shows Culicoides abundance can be predicted in each zones for a standard year. Our models are going to be used to model bluetongue virus serotype 8 (BTV8) spreading in mainland France. Indeed, efficiency evaluation of French surveillance and control system against BTV8 through informatic simulations requires disease diffusion model.

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