A mosquito pool collected from Lake in the Hills has tested positive for West Nile virus, McHenry County health department officials announced Wednesday.
The McHenry County Department of Health said in a news release that the mosquito pool was collected on Monday, June 2, marking the first positive test for West Nile virus in mosquitoes in the county during the 2025 season.
No human cases of West Nile virus have been reported in McHenry County this year, the health department states.
Culex mosquitoes, which are the primary carriers of West Nile, typically breed in stagnant water with high organic content, and are often found in artificial containers like rimless tires, abandoned swimming pools, buckets, bird baths, and clogged gutters.
Most people exposed to West Nile do not develop symptoms and there is no vaccine or treatment for West Nile virus, officials said.
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