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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;

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Table 2

Immunoglobulin G anti-West Nile virus prevalence in equines by breed, Camargue, France, 2000a

Breed class Total Positive (%) Prevalence Ratio 95% CI
Pure breeds 1,252 108 (8.6) 1.2 0.9 to 1.7
Camargue 1,743 183 (10.5) 1.5 1.2 to1.9
Ponies 497 38 (7.6) 1.0 0.7 to1.5
Other 1,375 100 (7.3) Ref.
Total 4,867 429 (8.8)

aChi square=11.12 (3 degrees of freedom), p=0.01; 95% CI = 95% confidence intervals.

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