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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†Comments to Author , David J. Dohm†, and Monica L. O'Guinn†
Author affiliations: *Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA;; †U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, Maryland, USA

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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).

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