Illinois health officials issue seasonal warning on ticks, mosquitoes and bats

FOX23 News at 9 p.m.

SPRINGFIELD, Ill., (KBSI) — The Illinois Department of Public Health is reminding residents to take precautions against illnesses spread by mosquitoes, ticks and animals as warmer weather arrives.

Health officials said mosquito season has already begun in Illinois, with the first mosquito batches testing positive for West Nile virus this year recently identified in Cook County. No human cases have been reported so far in 2026.

According to IDPH, Illinois reported 150 human cases of West Nile virus and 10 related deaths in 2025. Officials said symptoms can include fever, headache, nausea and muscle aches, while severe cases can lead to neurological complications or death.

IDPH is encouraging residents to “Fight the Bite” by reducing standing water, using insect repellent and reporting stagnant water sources where mosquitoes may breed.

Officials also warned about tickborne illnesses, including Lyme disease, ehrlichiosis and Powassan virus. IDPH said the state confirmed its first Powassan virus case last year. Residents are encouraged to wear protective clothing, use insect repellent and perform tick checks after spending time outdoors.

The department is also monitoring rabies cases in bats. Two bats have tested positive for rabies in Illinois so far this year, including cases in Whiteside and Sangamon counties. Officials urged residents to avoid contact with bats and ensure pets are current on rabies vaccinations.

IDPH said anyone bitten by an animal should seek medical attention immediately.