Springfield, IL – West Nile virus has been confirmed in environmental samples from 17 counties across Illinois as the state kicks off Mosquito Control Awareness Week, prompting public health officials to urge preventive action.
According to the Illinois Department of Public Health (IDPH), counties testing positive so far in 2025 include Bureau, Christian, Cook, DeKalb, DuPage, Fulton, Grundy, Hancock, Henry, Marshall, McDonough, McHenry, Peoria, Scott, Stark, Tazewell and Winnebago. No human cases have been reported yet this year, but IDPH notes that 2024 saw 69 confirmed human cases, including 13 deaths — the most since 2018.
The department advises following the “Three R’s” — Reduce, Repel, Report — to limit exposure. Residents are encouraged to eliminate standing water, wear protective clothing and EPA-approved repellents outdoors, and report stagnant water to local authorities.
The first confirmed West Nile-positive mosquito sample in Illinois this year was collected May 9 in Rockford.
West Nile virus is most commonly spread by the Culex mosquito, which becomes infected by feeding on infected birds. Most individuals do not show symptoms, though the virus can lead to fever, nausea, headache, and muscle aches. In severe cases, it may cause neurological complications, particularly among older adults.
The IDPH is investing $2.8 million in mosquito surveillance and control efforts across 97 local health departments. This includes funding for lab testing, community education, and environmental monitoring programs.
For the latest updates on West Nile virus activity in Illinois, residents can visit the IDPH West Nile Virus Surveillance page.
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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