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.