Table 2.
Culex Flavivirus Infection in 268 Culex Mosquito Pools Consisting of 134 Spatiotemporally Matched Pairs of West Nile Virus–Positive and West Nile Virus–Negative Pools from Suburban Chicago
|
Mosquito poolsa | |||
|---|---|---|---|
| CxFV positive | CxFV negative | Total | |
| WNV positive | 126 (95, 31) | 8 (4, 4) | 134 (99, 35) |
| WNV negative | 114 (79, 35) | 20 (13, 7) | 134 (92, 42) |
| Total | 240 (174, 66) | 28 (17, 11) | 268 (191, 77) |
|
Spatiotemporally matched pairs of WNV-positive and WNV-negative mosquito poolsb | |||
|---|---|---|---|
| Type of pair | Case (WNV positive) | Control (WNV negative) | No. of pairs |
| Discordant | CxFV positive | CxFV negative | 16 (10, 6) |
| Discordant | CxFV negative | CxFV positive | 4 (1, 3) |
| Concordant | CxFV positive | CxFV positive | 110 (74, 36) |
| Concordant | CxFV negative | CxFV negative | 4 (1, 3) |
| Total | — | — | 134 (86, 48) |
a
Numbers in parentheses indicate numbers of pools/pairs collected between June 30 and September 7, 2006, from 11 residential sites characterized by dense housing and 4 urban green space sites characterized by more diverse landscapes, respectively.
b
Results are significant by McNemar's test with continuity correction (χ2 = 6.050; p = 0.014).
WNV, West Nile virus.