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Volume 8, Number 8—August 2002

Research

West Nile Virus Outbreak in Horses, Southern France, 2000: Results of a Serosurvey

Benoit Durand*Comments to Author , Véronique Chevalier*, Régis Pouillot*, Jacques Labie*, Ingrid Marendat†, Bernadette Murgue†, Hervé Zeller†, and Stéphan Zientara*
Author affiliations: *Agence Française de Sécurité Sanitaire des Aliments, Maisons-Alfort, France; †Institut Pasteur, Paris, France;

Main Article

Table 3

Immunoglobulin G anti-West Nile virus individual-level prevalence in equines by group size, Camargue, France, 2000a

Group size Total Positive (%) Prevalence Ratio 95% CI
1–2 animals 1,353 165 (12.2) 2.2 1.6 to 3.0
3–6 animals 1,118 114 (10.2) 1.8 1.3 to 2.5
7–25 animals 1,355 87 (6.4) 1.1 0.8 to 1.5
>25 animals 1,281 55 (5.1) Ref.
Total 5,107 432 (9.7)

a Chi square = 54.11 (3 degrees of freedom), p<0.0001; 95% CI = 95% confidence intervals.

Main Article

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