Mosquitoes trapped in North Branford, Wethersfield and Wallingford have tested positive for West Nile virus.
The Connecticut Agricultural Experiment Station confirms mosquitoes collected from Cedar Lake in North Branford, South Elm Street in Wallingford and Goff Road in Wethersfield have tested positive for the virus.
State health officials have warned about a rapid increase in West Nile virus activity in Connecticut.
Recent tests show that infected mosquitoes are rising at levels that are higher than normal for this time of year, according to a release from Gov. Malloy's office.
Mosquitoes infected with West Nile have been found in 22 cities and towns across the state.
Experts urge people to wear long clothes, use mosquito repellent and avoid being outside at dusk and dawn when mosquitoes are most prevalent. They are also asking people to eliminate areas of standing water where mosquitoes breed.
Mosquitoes infected with West Nile have been found in Bethany, Bridgeport, Darien, East Haven, Easton, Franklin, Greenwich, Hartford, Madison, Manchester, Meriden, New Canaan, New Haven, Stamford, Stratford, Waterbury, Waterford, West Haven, Weston, and now North Branford, Wallingford and Wethersfield.
There have been no human cases of West Nile virus this season.