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Volume 7, Number 4—August 2001
THEME ISSUE
West Nile Virus
West Nile Virus

West Nile Virus Infection in Birds and Mosquitoes, New York State, 2000

Kristen A. Bernard*, Joseph G. Maffei*, Susan A. Jones*, Elizabeth B. Kauffman*, Gregory D. Ebel*, Alan P. Dupuis*, Kiet A. Ngo*, David C. Nicholas*, Donna M. Young*, Pei-Yong Shi*, Varuni L. Kulasekera†, Millicent Eidson*, Dennis J. White*, Ward B. Stone‡, Laura D. Kramer*, and NY State West Nile Virus Surveillance Team
Author affiliations: *New York State Department of Health, Albany, New York, USA; †New York City Department of Health, New York, New York, USA; ‡Department of Environmental Conservation, Albany, New York, USA

Main Article

Table 3

Summary of mosquitoes tested for West Nile virus in New York State in 2000

Epicenter
 Non-epicenter
Total Total
Total Total  positive Total Total  positive
Mosquito species mosquitoes pools pools MIRa mosquitoes pools pools
Aedes abserratus-punctor NCb NC NC NC 214 9 0
Ae. canadensis 8,018 167 0 0 8,269 145 0
Ae. cantator 1,615 65 1 0.62 993 22 0
Ae. cinereus 340 15 0 NAc 247 10 0
Ae. communis NC NC NC NC 335 12 0
Ae. communis group NC NC NC NC 235 8 0
Ae. intrudens 21 1 0 NA NC NC NC
Ae. japonicus 3,342 257 2 0.60 3,871 271 3
Ae. sollicitans 5,003 131 0 NA 1 1 0
Ae. stimulans NC NC NC NC 42 1 0
Ae. stimulans group 153 3 0 NA 540 17 0
Ae. taeniorhynchus 395 11 0 NA 11 1 0
Ae. trichuris NC NC NC NC 23 2 0
Ae. triseriatus 2,956 203 3 1.01 6,335 206 0
Ae. trivittatus 4,289 184 0 0 2,453 79 0
Ae. vexans 21,486 761 10 0.47 13,490 422 0
Aedes species 1,340 72 1 0.75 NC NC NC
Anopheles crucians 13 2 0 NA NC NC NC
An. punctipennis 165 37 1 NA 291 17 0
An. quadrimaculatus 66 18 0 NA 59 3 0
An. walkeri NC NC NC NC 833 22 0
Anopheles species 16 2 0 NA NC NC NC
Coquillettidia perturbans 8,167 157 0 0 10,874 206 0
Culiseta melanura 8,189 211 0 0 6,281 178 0
Cs. morsitans NC NC NC NC 1,821 85 0
Culiseta species 98 3 0 NA NC NC NC
Culex pipiens 22,120 831 78 3.53 8,698 288 1
Cx. pipiens-restuansd 114,517 3,208 211 1.84 16,228 537 1
Cx. restuans 3,403 190 0 0 794 48 0
Cx. salinarius 19,541 483 31 1.59 704 17 0
Cx. territans 76 15 0 NA NC NC NC
Culex species 5,358 200 19 3.55 1,108 32 0
Orthopodomyia alba NC NC NC NC 101 3 0
Psorophora ferox 63 10 1 NA 162 6 0
Uranotaenia sapphirina 208 19 0 NA 419 18 0
Unidentified
 1,173
 26
 0
 0
 105
 6
 0
TOTAL 232,131 7,282 358 85,537 2,672 5

a MIR = minimal infection rate per 1,000 mosquitoes. MIR calculated as (number of WN virus-positive pools by RT-PCR/total mosquitoes tested) x 1,000. MIR was calculated only if a minimum of 1,000 mosquitoes was tested from a defined region throughout the season. None of the counties outside the epicenter met this criterion.
bNC = not collected.
cNA = not applicable because <1,000 mosquitoes were collected.
d Cx. pipiens and Cx. restuans were not separated and were pooled together.

Main Article

1P. Bryon Backenson, Ivan Gotham, Yoichiro Hagiwara, Geraldine S. Johnson, Gary Lukacik, Kathryn Schmit, and Amy L. Willsey, Division of Epidemiology, New York State Department of Health

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