Volume 7, Number 6—December 2001
Research
Vector Competence of Selected North American Culex and Coquillettidia Mosquitoes for West Nile Virus
Michael R. Sardelis*, Michael J. Turell†
, David J. Dohm†, and Monica L. O'Guinn†
, David J. Dohm†, and Monica L. O'Guinn†Table 2
Infection, dissemination and estimated transmission rates for mosquitoes orally exposed to West Nile virus
| Species | Strain | Viral dosea | No. tested | Infection rateb | Dissemination ratec | Estimated transmission rate |
|---|---|---|---|---|---|---|
| Culex nigripalpus | Indian River | 4.6 | 7 | 29 ([4-71], 2) | 0 ([0-41], 0) | 0 |
| Indian River | 5.7±0.5 | 132 | 78 ([70-85], 103) | 8 ([4-14], 11) | 7 | |
| Indian River | 6.8±0.4 | 127 | 84 ([77-90], 107) | 12 ([7-19], 15) | 10 | |
| Cx. quinquefasciatus | Sebring | 5.5 | 16 | 50 ([25-75], 8) | 6 ([0-30], 1) | 6 |
| Sebring | 7.0±0.5 | 78 | 91 ([82-96], 71) | 22 ([13-33], 17) | 20 | |
| Vero Beach | 5.0 | 13 | 46 ([19-75], 6) | 0 ([0-25], 0) | 0 | |
| Vero Beach | 6.3 | 17 | 94 ([71-100], 16) | 12 ([1-36], 2) | <13 | |
| Cx. restuans | Maryland | 6.6±0.3 | 11 | 100 ([72-100], 11) | 55 ([23-83], 6) | 55 |
| Cx. salinarius | Chambers | 6.6±0.3 | 20 | 95 ([75-100], 19) | 60 ([36-81], 12) | 34 |
| Coquillettidia perturbans |
Laurel |
6.6±0.3 |
11 |
18 ([2-52], 2) |
9 ([0-41], 1) |
2 |
aLog10 PFU/mL of blood.
bPercentage of mosquitoes containing virus in their bodies ([95% confidence interval (CI)], number infected).
cPercentage of mosquitoes containing virus in their legs ([95% CI], number disseminated).
dThe estimated transmission rate = the percentage of mosquitoes that developed disseminated infection 12-14 days after ingesting WNV multiplied by the percentage of mosquitoes with disseminated infection that transmitted virus by bite (Table 3).
