Volume 13, Number 11—November 2007
Dispatch
Environmental Predictors of Human West Nile Virus Infections, Colorado
Jennifer L. Patnaik*
, Lara Juliusson*, and Richard L. Vogt*
, Lara Juliusson*, and Richard L. Vogt*Table 1
Number and proportion of human infections successfully predicted by positive environmental specimens, Tri-County Health Department, Colorado, 2003
| Total no. human infections | No. (%) human Infections successfully predicted by |
|||||
|---|---|---|---|---|---|---|
| Any environmental specimen | Birds | Mosquito pools | Equines | Sentinel chickens | ||
| Region | ||||||
| Urban (reference value) | 292 | 202 (69.2) | 176 (60.3) | 51 (17.5) | 35 (12.0) | 3 (0.9) |
| Rural | 112 | 59 (52.7)* | 30 (26.8)* | 28 (25.0) | 21 (18.8) | 1 (1.0) |
| Onset date† | ||||||
| June/July | 79 | 28 (35.4)* | 17 (21.5)* | 9 (11.4)* | 8 (10.1) | 0 |
| August | 273 | 196 (71.8) | 157 (57.5) | 54 (19.8) | 41 (15.0) | 4 (1.5) |
| September (reference value) |
47 |
34 (72.3) |
30 (63.8) |
14 (29.8) |
6 (12.8) |
0 |
| Total | 404‡ | 261 (64.6) | 206 (51.0) | 79 (19.6) | 56 (13.9) | 4 (1.0) |
*Significant at the p = 0.05 level.
†Five human case-patients had missing onset date.
‡Four human case-patients could not be geo-located.
