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Figure 4 | Veterinary Research

Figure 4

From: Quantification of the increase in the frequency of early calving associated with late exposure to bluetongue virus serotype 8 in dairy cows: implications for syndromic surveillance

Figure 4

Raw frequencies of early calving per calving month from October 2005 to September 2009. (A) 34 248 cows in 2616 reported case herds with clinical signs in 2007; (B) 209 231 cows in 9540 unexposed herds located in Brittany; (C) 26 701 cows in 1498 unexposed herds located in the Southwest of France. B and C composed the unexposed population BTV-8 in 2007; (D) 17 139 cows in 2616 herds that reported clinical signs in 2007 exposed during the last 10 weeks of pregnancies. Population D is a subset of the population A. (E) 20 139 cows in 4008 herds for which a date of exposure was interpolated during the last 10 weeks of pregnancies. These herds were non-reported during the 2007 outbreak but located in the outbreak area. The two red vertical lines correspond to the 2007 outbreak period in France.

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Veterinary Research

ISSN: 1297-9716