Table 3. Number of bats with definitive test result (N = 2,809), number and percent of bats positive for RABV, and odds ratio for RABV positivity, Washington State—2000–2016.
Categories of bat signs and behaviors are not mutually exclusive. Bold font indicates statistical significance.
| No. bats tested | No. bats rabies positive | % bats rabies positive | Odds ratio | (95% CI) | P value | |
|---|---|---|---|---|---|---|
| Bat Clinical Signs | ||||||
| Alive, no abnormal behavior | 2,427 | 158 | 6.5 | Reference | ||
| Abnormal behavior | 121 | 26 | 21.5 | 3.9 | 2.5–6.2 | <0.0001 |
| Alive, no abnormal hiding | 2,512 | 178 | 7.1 | Reference | ||
| Abnormal hiding | 36 | 6 | 16.7 | 2.6 | 1.1–6.4 | 0.03 |
| Alive, not injured | 2,182 | 127 | 5.8 | Reference | ||
| Injured | 366 | 57 | 15.6 | 3.0 | 2.1–4.2 | <0.0001 |
| Alive, no bite | 2,402 | 142 | 5.9 | Reference | ||
| Bite | 146 | 42 | 28.8 | 6.4 | 4.3–9.5 | <0.0001 |
| Not in a body of water | 2,788 | 186 | 6.7 | Reference | ||
| In a body of water | 21 | 4 | 19.0 | 3.3 | 1.1–9.9 | 0.03 |
| Vital Status | ||||||
| Dead | 261 | 6 | 2.3 | Reference | ||
| Alive (downed) | 2,516 | 183 | 7.3 | 3.3 | 1.5–7.6 | <0.05 |
| Alive (inflight collision) |
32 | 1 | 3.1 | 1.4 | 0.2–11.8 | 0.8 |
| Location of Bat Encounter | ||||||
| Inside house | 1,828 | 76 | 4.2 | Reference | ||
| Inside other structure | 101 | 6 | 5.9 | 1.5 | 0.6–3.4 | 0.4 |
| Outdoors | 195 | 29 | 14.9 | 4.0 | 2.5–6.4 | < 0.05 |
| Bat Interaction with Household Pets | ||||||
| Caught by cat | 330 | 15 | 4.5 | Reference | ||
| Caught by dog | 39 | 6 | 15.4 | 3.8 | 1.4–10.5 | < 0.05 |