West Nile Virus Detected In South Windsor Mosquitoes

SOUTH WINDSOR, CT — Mosquitoes collected in South Windsor have tested positive for West Nile virus, according to state testing data.

South Windsor is among 22 Connecticut communities where the virus has been detected in mosquitoes this year, according to the Connecticut Agricultural Experiment Station.

The statewide total has climbed from 12 towns listed July 31 to 22 as of Wednesday. No human cases have been reported in Connecticut this season, and the state has not detected eastern equine encephalitis in any mosquito samples.

The public summary does not identify the collection date or mosquito species tied to the South Windsor finding.

The state tests mosquitoes from June through October at 108 trapping stations in 88 municipalities. Once a virus is detected at a site, trapping there is increased to at least once a week.

West Nile virus is spread through the bite of an infected mosquito. Most people who become infected do not develop symptoms. About one in five experience fever, headache, body aches, joint pain, vomiting, diarrhea or a rash.

Fewer than 1 percent develop a serious illness affecting the brain, spinal cord or surrounding tissue. In 2025, six Connecticut residents were hospitalized with West Nile virus, and one death was reported.

South Windsor treated storm drains, catch basins and other standing-water locations with larvicide in July as part of its annual mosquito-control program, Patch previously reported.

Health officials recommend using an EPA-registered insect repellent, covering exposed skin and limiting time outside between dusk and dawn, when mosquitoes are most active. Residents should also repair damaged window screens and empty containers that collect standing water.

Additional mosquito testing results and prevention information are available through the Connecticut Mosquito Management Program.

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