Mosquitos in McHenry and DuPage counties have tested positive for West Nile virus, public health officials announced.

A mosquito pool collected from Lake in the Hills on June 2 tested positive for the virus, making the pool the first mosquitoes to test positive for West Nile for the 2025 season, the McHenry County Department of Health said.

Meanwhile, in DuPage County, mosquito pools collected in Roselle, Medinah, Clarendon Hills, and Burr Ridge on May 27 also tested positive for the virus, according to the DuPage County Health Department.

No human cases have been reported so far this year in either county.

Most people exposed to the virus do not develop symptoms, though illness typically occurs two to 14 days after the bite of an infected mosquito, the department said.

“As more peopl

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