Abstract
Fourteen isolations of West Nile (WN) virus were obtained from four mosquito species (Culex pipiens [5], Cx. restuans [4], Cx. salinarius [2], and Culiseta melanura [3]) in statewide surveillance conducted from June through October 2000. Most isolates were obtained from mosquitoes collected in densely populated residential locales in Fairfield and New Haven counties, where the highest rates of dead crow sightings were reported and where WN virus was detected in 1999. Minimum field infection rates per 1,000 mosquitoes ranged from 0.5 to 1.8 (county based) and from 1.3 to 76.9 (site specific). Cx. restuans appears to be important in initiating WN virus transmission among birds in early summer; Cx. pipiens appears to play a greater role in amplifying virus later in the season. Cs. melanura could be important in the circulation of WN virus among birds in sylvan environments; Cx. salinarius is a suspected vector of WN virus to humans and horses.
Highlights
Fourteen isolations of West Nile (WN) virus were obtained from four mosquito species (Culex pipiens [5], Cx. restuans [4], Cx. salinarius [2], and Culiseta melanura [3]) in statewide surveillance conducted from June through October 2000
Expanded mosquito surveillance in the affected region yielded the first isolates of the virus from two species of mosquitoes, Aedes vexans and Culex pipiens, that were trapped in Greenwich, adjacent to the New York border, in mid-September
New sites were located in lower Fairfield and New Haven counties, where mosquitoes and dead crows infected with WN virus were found in 1999, and where it was thought that WN virus was most likely to reemerge in 2000
Summary
Fourteen isolations of West Nile (WN) virus were obtained from four mosquito species (Culex pipiens [5], Cx. restuans [4], Cx. salinarius [2], and Culiseta melanura [3]) in statewide surveillance conducted from June through October 2000. Expanded mosquito surveillance in the affected region yielded the first isolates of the virus from two species of mosquitoes, Aedes vexans and Culex pipiens (one pool each), that were trapped in Greenwich, adjacent to the New York border, in mid-September. Fourteen isolates of WN virus were obtained from four mosquito species: Cx. pipiens (5 isolates), Cx. restuans (4 isolates), Cx. salinarius (2 isolates), and Cs. melanura (3 isolates).
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