Volume 11, Number 9—September 2005
Research
West Nile Virus–infected Mosquitoes, Louisiana, 2002
Table 4
Estimated mosquito pool West Nile virus (WNV) infection rates per 1,000 mosquitoes and 95% confidence intervals (CIs)*
| Parish | Site† | Sampling period | Trap type‡ | WNV+ pools | Species | No. mosquitoes tested | Infection rate: MLE (95% CI) |
|---|---|---|---|---|---|---|---|
| St. Tammany | B | Aug 3–6 | Light | 1 | Cx. salinarius | 92 | 10.91 (5.46–21.83) |
| E | Aug 12–15 | Gravid | 2 | Cx. quinquefasciatus | 829 | 2.61 (1.31–5.22) | |
| F | Aug 12–15 | Gravid | 1 | Cx. quinquefasciatus | 427 | 2.31 (1.16–4.62) | |
| l | Aug 14–15 | Gravid | 1 | Cx. quinquefasciatus | 223 | 5.64 (2.82–11.28) | |
| Tangipahoa | A | Aug 7–10 | Light | 1 | Cq. perturbans | 1,223 | 0.81 (0.41–1.62) |
| B | Aug 7–10 | Gravid | 3 | Cx. quinquefasciatus | 922 | 3.41 (1.71–6.82) |
*Calculated by using a bias-corrected maximum likelihood estimate (MLE).
†Capital letters denote confirmed WNV neuroinvasive disease and WNV fever case sites; italicized lower case letters denote non-WNV case sites.
‡Light denotes CO2-baited CDC miniature light trap; gravid denotes Reiter gravid trap.
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