Journal
SCIENCE
Volume 303, Issue 5663, Pages 1535-1538Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1094247
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Funding
- NIGMS NIH HHS [1R01GM063258] Funding Source: Medline
- ODCDC CDC HHS [U50/CCU220532] Funding Source: Medline
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In the Old World, some mosquitoes in the Culex pipiens complex are excellent enzootic vectors of West Nile virus, circulating the virus among birds, whereas others bite mainly humans and other mammals. Here we show that, in northern Europe, such forms differing in behavior and physiology have unique microsatellite fingerprints with no evidence of gene flow between them, as would be expected from distinct species. In the United States, however, hybrids between these forms are ubiquitous. Such hybrids between human-biters and bird-biters may be the bridge vectors contributing to the unprecedented severity and range of the West Nile virus epidemic in North America.
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