Table 2.
West Nile virus (WNV) infection rates (determined by maximum likelihood estimate) of Culex mosquitoes from supplemental collections in premises where WNV activity in chickens had been recently detected, Puerto Barrios, Guatemala, 2007
| Culex species | Site number (corresponding macrohabitat type)/collection date | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| # 7 (rural)/5-Jul-07 | # 3 (urban)/3-Aug-07 | # 5 (urban)/9-Aug-07 | ||||||||||
| No. pools | No. pos pools | No. individuals | IR* (95% CI) | No. pools | No. pos pools | No. individuals | IR (95% CI) | No. pools | No. pos pools | No. individuals | IR (95% CI) | |
| quinquefasciatus | 6 | 1 | 176 | 5.7 (0.3–30.7) | 3 | 1 | 62 | 15.7 (1.1–107.5) | 2 | 0 | 26 | – |
| mollis/inflictus | 6 | 1 | 212 | 4.7 (0.3–24.7) | 2 | 0 | 88 | – | 7 | 1 | 267 | 3.5 (0.2–17.0) |
| nigripalpus | 10 | 0 | 456 | – | 5 | 0 | 236 | – | 12 | 0 | 590 | – |
| undifferentiated | 9 | 1 | 342 | 2.9 (0.2–14.8) | 1 | 1 | 50 | 20.0(NA) | 3 | 1 | 106 | 9.0 (0.6–57.5) |
| All other Cx. species | 7 | 0 | 116 | – | 7 | 0 | 90 | – | 13 | 0 | 355 | – |
*
IR = WNV infection rate expressed per 1,000 mosquitoes; NA = method to calculate 95% confidence interval for infection rate is not applicable.