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Volume 16, Number 12—December 2010

Research

Anatomy of Bluetongue virus Serotype 8 Epizootic Wave, France, 2007-2008

Benoit DurandComments to Author , Gina Zanella, Fabienne Biteau-Coroller, Caroline Locatelli, Florence Baurier, Cécile Simon, Eric Le Dréan, José Delaval, Eric Prengère, Véronique Beauté, and Hélène Guis

Author affiliations: Agence Française de Sécurité Sanitaire des Aliment, Maisons-Alfort, France (B. Durand, G. Zanella); Centre International de Recherche Agronimique pour le Développement, Montpellier, France (F. Biteau-Coroller, H. Guis); Laboratoire Départemental d'Analyses 08, Hagnicourt, France (C. Locatelli); Laboratoire Départemental d'Analyses 18, Bourges, France (F. Baurier, C. Simon); Laboratoire Départemental d'Analyses 35, Rennes, France (E. Le Dréan); Laboratoire Départemental d'Analyses 36, Chateauroux, France (J. Delaval); Laboratoire Départemental d'Analyses 37, Tours, France (J. Delaval, E. Prengère); and Laboratoire Départemental d'Analyses 49, Angers, France (V. Beauté)

Main Article

Table 2

Animal-level anti–bluetongue virus serotype 8 seroprevalence rate and distribution of within-herd seroprevalence rates in seropositive herds or flocks of 7 departments, France, winter 2007–2008*

Species Department code No. positive/no. tested Animal-level seroprevalence (95% CI†) Median within-herd seroprevalence in seropositive herds (25%–75% quartiles)
Cattle 08 1,563/1,573 0.99 (0.99–1.00) 1.00 (1.00–1.00)
18 642/1,530 0.42 (0.39–0.44) 0.40 (0.23–0.57)
41 203/1,500 0.16 (0.14–0.17) 0.15 (0.07–0.27)
36 103/1,470 0.07 (0.06–0.08) 0.10 (0.07–0.17)
37 103/1,500 0.07 (0.06–0.08) 0.10 (0.05–0.13)
49 1/1,410 0.001 (0.000–0.003) 0.03‡

35
2/905
0.002 (0.000–0.007)
0.03§
Sheep 08 478/833 0.57 (0.54–0.61) 0.70 (0.43–0.87)
18 19/874 0.02 (0.01–0.03) 0.08 (0.06–0.10)
36 0/326 0.00 (0.00–0.01) NA
35 0/432 0.00 (0.00–0.01) NA

*CI, confidence interval; NA, no seropositive flock.
†Exact binomial 95% CI.
‡A single seropositive herd.
§Two seropositive herds or flocks with the same within-herd seroprevalence.

*CI, confidence interval; NA, no seropositive flock.
†Exact binomial 95% CI.
‡A single seropositive herd.
§Two seropositive herds or flocks with the same within-herd seroprevalence.

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