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Table 4 BTV-8 seroprevalence in cattle in the winter of 2015-2016 per birth cohort and region in France

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

Birth cohort

Proportion of positive results per region (%)

Proportion of doubtful results per region (%)

Median

Min - Max

Range

Median of the 95% CI range

Median

Min - Max

Range

Median of the 95% CI range

< July 2008

96.5

85.6 - 99.1

13.5

5.7

0.0

0.0 – 2.3

2.3

2.1

July 2008 - June 2009

75.4

65.7 – 90.4

24.7

20.9

3.6

1.2 – 5.4

4.2

10.5

July 2009 - June 2010

30.1

19.5 – 53.7

34.2

19.3

3.0

0.0 – 8.3

8.3

8.5

July 2010 - June 2011

11.9

1.1 – 21.7

20.6

13.4

1.6

0.0 – 3.6

3.6

4.5

July 2011 - June 2012

5.8

0.0 – 9.6

9.6

7.2

1.0

0.0 – 1.8

1.8

4.0

July 2012 - June 2013

1.0

0.2 – 4.6

2.6

1.7

0.0

0.0 - 1.4

1.4

0.6

> June 2013*

0.7

0.0 – 4.6

4.6

1.2

0.2

0.0 - 1.4

1.4

0.6

  1. *Cattle > 12 months old