BOSTON (AP) -- Massachusetts health officials say Eastern equine encephalitis has been found in mosquitoes for the first time this summer.

The Department of Public Health announced Wednesday that four positive samples were collected Monday in Easton, in Bristol County. No human cases have been reported. Two of the samples were mammal-biting mosquitoes.

The state had two cases of EEE last year, including a Bristol County man who died.

Dr. Al DeMaria, the state epidemiologist, said it's early in the season for EEE. He said people should take common-sense precautions to avoid mosquito bites.

State officials say the threat of mosquito-borne illness is considered "high" in Easton, Raynham, and Taunton. They'll discuss mosquito control with local officials, and recommend curtailing evening events.

The West Nile virus has also been found in mosquitoes this year, with no human cases.