The state Mosquito Management Program said Wednesday that mosquitoes trapped in Stamford June 14 tested positive for the virus. Theodore Andreadis, chief medical entomologist, says it could be due to the warm weather.
He says the early start is a concern because more cases could develop throughout the summer and peak earlier than usual.
Andreadis says West Nile virus is typically first detected in July.
The Department of Public Health advises people to take precautions to prevent mosquito bites. Symptoms are a rapid onset of fever, headaches, muscle aches and nausea.
Last year, cool temperatures and frequent rain helped curb West Nile virus in Connecticut.