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. 2006 Mar;12(3):468-74.
doi: 10.3201/eid1203.051004.

Host feeding patterns of Culex mosquitoes and West Nile virus transmission, northeastern United States

Goudarz Molaei  1 , Theodore G Andreadis, Philip M Armstrong, John F Anderson, Charles R Vossbrinck
Affiliations

Host feeding patterns of Culex mosquitoes and West Nile virus transmission, northeastern United States

Goudarz Molaei et al. Emerg Infect Dis. 2006 Mar.

Abstract

To evaluate the role of Culex mosquitoes as enzootic and epidemic vectors for WNV, we identified the source of vertebrate blood by polymerase chain reaction amplification and sequencing portions of the cytochrome b gene of mitochondrial DNA. All Cx. restuans and 93% of Cx. pipiens acquired blood from avian hosts; Cx. salinarius fed frequently on both mammals (53%) and birds (36%). Mixed-blood meals were detected in 11% and 4% of Cx. salinarius and Cx. pipiens, respectively. American robin was the most common source of vertebrate blood for Cx. pipiens (38%) and Cx. restuans (37%). American crow represented <1% of the blood meals in Cx. pipiens and none in Cx. restuans. Human-derived blood meals were identified from 2 Cx. salinarius and 1 Cx. pipiens. Results suggest that Cx. salinarius is an important bridge vector to humans, while Cx. pipiens and Cx. restuans are more efficient enzootic vectors in the northeastern United States.

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Figures

Figure
Figure
Geographic distribution of West Nile virus isolations from mosquitoes in relation to human population density and mosquito trapping in Connecticut, 2002–2004. "WNV-positive site" indicates that virus isolations were made from mosquitoes collected from these trapping locations.
See this image and copyright information in PMC

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