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Chicago, IL – Northern Illinois is reporting the majority of human West Nile virus (WNV) cases in 2025, with state health officials urging residents to take precautions as mosquito activity remains high.
According to the Illinois Department of Public Health (IDPH), 42 human cases of WNV have been confirmed across the state this year. Of those, 39 were detected in Northern Illinois, including Cook, Will, Lake, DuPage, and DeKalb counties. Cook County leads with 34 cases, while Will County confirmed its first patient in August, an individual in their 80s. Lake County reported two cases, and both DuPage and DeKalb counties each identified one.
Statewide, 3,575 mosquito batches from 67 counties have tested positive for WNV this season. The Will County Health Department reported positive mosquito pools in 11 communities, including Joliet, Bolingbrook, Frankfort, and Plainfield.
“With mosquito season underway in Illinois, it is now time for Illinoisans, especially seniors and those with weakened immune systems, to start taking precautions,” said IDPH Director Dr. Sameer Vohra. “The best way to ‘Fight the Bite’ is to reduce, repel and report.”
The Centers for Disease Control and Prevention (CDC) notes that while most infected people do not develop symptoms, about one in five may experience fever, body aches, or rash. Severe illness, including encephalitis or meningitis, occurs in about one in 150 cases, with higher risk among adults over 60 or those with chronic medical conditions.
Health officials recommend eliminating standing water, keeping windows screened, wearing long sleeves outdoors, and using EPA-approved repellents. Residents are also encouraged to report stagnant water sites to local health departments for mosquito control.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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