Table 3.
Maximum likelihood estimates of WNV infection incidence for mosquitoes collected in each of three locations with Kern County, California, 2004–2007
| Location | Species | Pools | Positives | Infection incidence per 1,000 |
|||
|---|---|---|---|---|---|---|---|
| Total | MLE | LL | UL | ||||
| Northwest | Cx. tarsalis | 973 | 104 | 41,524 | 2.66 | 2.18 | 3.20 |
| Cx. quinquefasciatus | 459 | 65 | 17,392 | 4.09 | 3.19 | 5.19 | |
| Ae. melanimon | 803 | 4 | 36,063 | 0.11 | 0.04 | 0.27 | |
| Cx. erythrothorax | 197 | 3 | 8,497 | 0.36 | 0.09 | 0.96 | |
| Bakersfield | Cx. tarsalis | 1,259 | 144 | 50,685 | 3.04 | 2.57 | 3.57 |
| Cx. quinquefasciatus | 1,960 | 385 | 64,821 | 6.82 | 6.16 | 7.53 | |
| Ae. melanimon | 149 | 0 | 6,013 | ||||
| Others | 110 | 0 | 3,990 | ||||
| Southeast | Cx. tarsalis | 385 | 80 | 17,190 | 5.26 | 4.20 | 6.52 |
| Cx. quinquefasciatus | 230 | 32 | 9,946 | 3.48 | 2.42 | 4.86 | |
| Ae. melanimon | 0 | 0 | 0 | ||||
| Others | 1 | 0 | 11 | ||||
| Totals | 6,526 | 817 | 256,132 | 3.51 | 3.27 | 3.76 | |
MLE, maximum likelihood estimates; LL and UL, lower and upper 95% confidence intervals.