The McHenry County Health Department recently confirmed its first case of West Nile virus in a human. Residents should take precautions as the risk of the mosquito-borne virus lasts until the first hard frost. Daily Herald file

West Nile virus has been detected in mosquitoes in McHenry County, according to health officials.

The mosquitoes were collected from Lake in the Hills on June 2 and mark the first positive test for the virus in mosquitoes in the 2025 season in McHenry County. No cases have been reported yet in humans in McHenry County this year.

Mosquito season runs from May to October annually, and the risk of transmission of the virus lasts until “the first hard frost,” according to a press release from the McHenry County Department of Health.

Individuals can protect themselv

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