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Table 3 BTV-8 seroprevalence in French cattle in the winter of 2015-2016 per birth cohort and the département’s BTV-8 status

From: Estimation of French cattle herd immunity against bluetongue serotype 8 at the time of its re-emergence in 2015

Birth cohort BTV-8 non-infected départements   BTV-8 infected départements
No. analyses ELISA positive   ELISA doubtful   No. analyses ELISA positive   ELISA doubtful
No. % (CI 95%)   No. % (CI 95%)   No. % (CI 95%)   No. % (CI 95%)
< July 2008 1310 1254 95.7 [94.5 - 96.8]   4 0.3 [0.1 - 0.8]   866 814 94.0 [92.2 - 95.5]   2 0.2 [0 - 0.8]
July 2008 - June 2009 467 368 78.8 [74.8 - 82.4]   16 3.4 [2.0 - 5.5]   226 163 72.1 [65.8 - 77.9]   9 4.0 [1.8 - 7.4]
July 2009 - June 2010 617 194 31.4 [27.8 - 35.3]   23 3.7 [2.4 - 5.5]   317 108 34.1 [28.9 - 39.6]   6 1.9 [0.7 - 4.1]
July 2010 - June 2011 718 76 10.6 [8.4 - 13.1]   7 1.0 [0.4 - 2.0]   438 72 16.4 [13.1 - 20.2]   10 2.3 [1.1 - 4.1]
July 2011 - June 2012 1134 37 3.3 [2.3 - 4.5]   5 0.4 [0.1 - 1.0]   710 57 8.0 [6.1 - 10.3]   13 1.8 [1.0 - 3.1]
July 2012 - June 2013 4342 37 0.9 [0.6 - 1.2]   15 0.3 [0.2 - 0.6]   3179 75 2.3 [1.9 - 2.9]   2 0.1 [0 - 0.2]
> June 2013* 5428 25 0.5 [0.4 - 0.7]   25 0.5 [0.3 - 0.7]   3891 102 2.6 [2.1 - 3.2]   5 0.1 [0 - 0.3]
  1. *Cattle > 12 months old