Table 3.
Host-seeking and resting adult female mosquitoes collected in the East Valley of Maricopa County, AZ, during September 2012, as part of an evaluation of vertebrate hosts of West Nile virus*
| Species | Behavior | Location | Total | Total tested | Pools tested | Positive pools† | Infection rate (95% CI) | |
|---|---|---|---|---|---|---|---|---|
| Roost | Non-roost | |||||||
| Aedes aegypti | Host-seeking | 34 | 11 | 45 | ||||
| Resting | 4 | 0 | 4 | |||||
| Combined | 49 | 48 | 2 | 0 | 0.0 (0.0–33.1) | |||
| Aedes vexans | Host-seeking | 0 | 2 | 2 | ||||
| Resting | 0 | 0 | 0 | |||||
| Combined | 2 | 0 | 0 | NA | NA | |||
| Anopheles franciscanus | Host-seeking | 0 | 0 | 0 | ||||
| Resting | 2 | 1 | 3 | |||||
| Combined | 3 | 2 | 2 | 0 | 0.0 (0.0–657.6) | |||
| Culex species | Host-seeking | 1 | 3 | 4 | ||||
| Resting | 0 | 0 | 0 | |||||
| Combined | 4 | 4 | 2 | 0 | 0.0 (0.0–391.8) | |||
| Cx. quinquefasciatus | Host-seeking | 57 | 68 | 125 | ||||
| Resting | 348 | 8 | 356 | |||||
| Combined | 481 | 481 | 140 | 2 | 4.3 (0.8–14.1) | |||
| Cx. tarsalis | Host-seeking | 11 | 68 | 79 | ||||
| Resting | 118 | 13 | 131 | |||||
| Combined | 210 | 210 | 57 | 1 | 4.7 (0.3–22.4) | |||
| Psorophora columbiae | Host-seeking | 36 | 546 | 582 | ||||
| Resting | 1 | 0 | 1 | |||||
| Combined | 583 | 583 | 21 | 0 | 0.0 (0.0–5.7) | |||
*
Collections were categorized according to the presence or absence of a nocturnal communal bird roost.
†
The two positive pools for Cx. quinquefasciatus were collected at non-roost locations. The positive pool for Cx. tarsalis was collected at a roost location. The roost contained doves and grackles.
CI = confidence interval; NA = not applicable.