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Serological status for BTV-8 in French cattle prior to the 2015 re-emergence

Abstract : Undetected in Europe since 2010, bluetongue virus serotype 8 (BTV-8) re-emerged in August 2015 in Central France. To gain insight into the re-emergence on the French territory, we estimated the seroprevalence in cattle before the detection of BTV-8 in 2015, in areas differentially affected by the current outbreak. A retrospective survey based on the analysis of stored sera was thus conducted in the winter preceding the re-emergence in seven French departments including the one where the virus was first detected. A total of 10,066 sera were retrieved from animals sampled in 444 different herds in winter 2014/15. Between-herd seroprevalence revealed the presence of seropositive animals in almost all herds sampled (97.4%). The animal-level seroprevalence averaged at 44%, with a strong age pattern reflecting the cumulative exposure to both natural infection and to vaccination. A multivariable analysis allowed separating the respective effects of both exposures. A higher proportion of seropositivity risk was attributed to vaccination (67.4%) than to exposure to natural infection (24.2%). The evolution of seroprevalence induced by the two main risk factors in 74 mainland departments was reconstructed between the vaccination ban (2013) and the re-emergence (2015). We showed a striking decrease in seroprevalence with time after the vaccination ban, due to population renewal, which could have facilitated virus transmission leading to the current outbreak situation.
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Submitted on : Wednesday, November 17, 2021 - 12:55:51 PM
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N. Courtejoie, B. Durand, E. Bréard, C. Sailleau, D. Vitour, et al.. Serological status for BTV-8 in French cattle prior to the 2015 re-emergence. Transboundary and Emerging Diseases, 2018, 65 (1), pp.e173-e182. ⟨10.1111/tbed.12718⟩. ⟨hal-03432658⟩



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