Table 1.
Most abundant mosquito species collected during 2002 surveillance in five Wisconsin counties.
| Mosquito species | Number collected | |
| Aedes vexans1 | 13,364 | |
| Ochlerotatus trivittatus1 | 9,248 | |
| Culex tarsalis1 | 1096 | |
| Coquillettidia perturbans1 | 765 | |
| Culex pipiens/restuans1,2 | 679 | |
| Ochlerotatus canadensis1 | 233 | |
| Culex erraticus1 | 191 | |
| Ochlerotatus triseriatus1 | 167 | |
| All other species3 | 314 | |
| Aedes cinereus1 | ||
| Anopheles crucians1 | ||
| Anopheles punctipennis1 | ||
| Anopheles quadrimaculatus s.l.1 | ||
| Anopheles walkeri | ||
| Culex salinarius1 | ||
| Culiseta inornata1 | ||
| Culiseta morsitans | ||
| Ochlerotatus abserratus | ||
| Ochlerotatus dorsalis | ||
| Ochlerotatus excrucians | ||
| Ochlerotatus fitchii | ||
| Ochlerotatus sollicitans1 | ||
| Ochlerotatus stimulans | ||
| Psorophora ferox1 | ||
| Uranotaenia sapphirina1 | ||
| Unidentified species | 5,362 | |
| Total | 31,419 | |
1 Indicates mosquito species from which WNV has been isolated in the United States. Virus isolation from field-collected specimens does not incriminate a mosquito as a competent vector. This determination requires more extensive transmission study.
2 Because of only minor morphological differences between these species, they are often difficult to discriminate and therefore are often pooled together.
3 Sixteen additional species were identified with the total number under 50 individuals/species.