A limited number of counties and states tested mosquitoes (639 counties
in 37 states and DC), wild-caught birds (65 counties in eight states), and
sentinel chickens (92 counties in eight states) as part of WNV surveillance.
In 2002, approximately 1.3 million mosquitoes of 88 species were tested. WNV
was detected in 4,943 pools (representing 26 species) from 315 counties in
28 states and DC. Culex mosquitoes (Cx. pipiens, Cx. restuans, Cx. salinarius, Cx. quinquefasciatus, and Cx. tarsalis) accounted for 2,717 (55%) WNV-positive pools.
WNV was reported for the first time in seven mosquito species (Aedes aegypti, Anopheles walkeri, Cx. erraticus, Cx. tarsalis, Cx. territans,
Culiseta inornata, and Psorophora ciliata).
Since 1999, a total of 36 WNV-infected mosquito species have been reported
to ArboNET. In 2002, a total of 144 seropositive wild-caught birds were reported
from 25 counties in four states (Indiana, Kansas, Louisiana, and Ohio), and
366 seroconverting captive sentinel birds were reported from 47 counties in
seven states (Florida, Iowa, Nebraska, New York, North Carolina, Pennsylvania,