Table 1. Detection of Coxiella infection among horses raised in Korea between 2007 and 2013.
| Group | No. tested | No. (%) of horses | ||||
|---|---|---|---|---|---|---|
| ELISA | PCR | |||||
| Positive | 95% CI† | Positive | 95% CI† | |||
| Region | Northern | 295 | 7 (2.4) | 0.6–4.1 | 5 (1.7) | 0.2–3.2 |
| Central | 184 | 2 (1.1) | 0–2.6 | 0 | 0 | |
| Southern | 243 | 2 (0.8) | 0–2.0 | 0 | 0 | |
| Jeju Island | 94 | 0 | 0 | 1 (1.1) | 0–3.1 | |
| Breed | Thoroughbred | 566 | 11 (1.9) | 0.8–3.1 | 5 (0.9) | 0.1–1.7 |
| Native Korean pony | 109 | 0 | 0 | 1 (0.9) | 0–2.7 | |
| Warm blood | 61 | 0 | 0 | 0 | 0 | |
| Mixed | 80 | 0 | 0 | 0 | 0 | |
| Sex | Male | 159 | 3 (1.9) | 0–4.0 | 1 (0.6) | 0–1.9 |
| Female | 283 | 5 (1.8) | 0.2–3.3 | 3 (1.1) | 0–2.3 | |
| Castrated | 280 | 3 (1.1) | 0–2.3 | 1 (0.4) | 0–1.1 | |
| Unknown | 94 | 0 | 0 | 1 (1.1) | 0–3.1 | |
| Age | <5 | 271 | 5 (1.8) | 0.2–3.5 | 5 (1.8)* | 0.2–3.5 |
| 5–10 | 249 | 4 (1.6) | 0.1–3.2 | 0 | 0 | |
| >10 | 202 | 2 (1) | 0–2.4 | 0 | 0 | |
| Unknown | 94 | 0 | 0 | 1 (1.1) | 0–3.1 | |
| Total | 816 | 11 (1.3) | 0.6–2.1 | 6 (0.7) | 0.2–1.3 |
*Significantly different, p < 0.05
†CI = confidence interval.