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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 1

Herd-level anti–bluetongue virus serotype 8 seroprevalence rate and clinical expression of bluetongue disease in 7 departments, France, winter 2007–2008*

Species Department code No. positive†/no. tested Herd-level seroprevalence (95% CI‡) No. outbreaks§ Reporting rate¶ (95% CI)
Cattle 08 63/63 1.00 (0.94–1.00) 37 0.59 (0.46–0.71)
18 49/49 1.00 (0.93–1.00) 4 0.08 (0.02–0.20)
41 42/50 0.84 (0.71–0.93) 3 0.07 (0.01–0.19)
36 29/48 0.60 (0.45–0.74) 1 0.03 (0.00–0.18)
37 31/50 0.62 (0.47–0.75) 0 0.00 (0.00–0.11)
49 1/50 0.02 (0.00–0.11) 0 0.00 (0.00–0.98)

35
2/50
0.04 (0.00–0.14)
0
0.00 (0.00–0.84)
Sheep 08 42/44 0.95 (0.85–0.99) 23 0.55 (0.39–0.70)
18 14/59 0.24 (0.14–0.37) 2 0.14 (0.02–0.43)
36 0/4 0.00 (0.00–0.60) NA NA
35 0/50 0.00 (0.00–0.07) NA NA

*CI, confidence interval; NA, no seropositive flock.
†No. seropositive herds: >1positive result among tested serum samples.
‡Exact binomial 95% CI.
§No. seropositive herds with reported confirmed clinical disease in 2007.
¶Proportion of seropositive herds with reported confirmed clinical cases in 2007.
*CI, confidence interval; NA, no seropositive flock.
†No. seropositive herds: >1positive result among tested serum samples.
‡Exact binomial 95% CI.
§No. seropositive herds with reported confirmed clinical disease in 2007.
¶Proportion of seropositive herds with reported confirmed clinical cases in 2007.

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