Springfield, IL – Illinois health officials are urging residents to take precautions against mosquitoes, ticks, and bats as warmer weather increases the risk of exposure to potentially serious illnesses across the state.
According to the Illinois Department of Public Health, the first mosquito batches to test positive for West Nile virus in 2026 were recently identified in Cook County. No human cases have been confirmed so far this year, but Illinois reported 150 human cases and 10 deaths linked to West Nile virus during 2025.
Health officials said West Nile virus spreads through bites from infected Culex mosquitoes, commonly known as house mosquitoes. While many infected people experience no symptoms, others may develop fever, headaches, nausea, muscle aches, or, in severe cases, neurological complications including meningitis or paralysis.
The IDPH is encouraging residents to “Fight the Bite” by reducing standing water around homes, using EPA-approved insect repellents, and reporting stagnant water locations that may become mosquito breeding grounds.
Officials also warned about growing concerns tied to tickborne illnesses, including Lyme disease, ehrlichiosis, and spotted fever group rickettsiosis. Last year, Illinois confirmed its first reported Powassan virus case in a resident. State health officials recommend wearing long sleeves and light-colored clothing outdoors, checking for ticks after hikes or yardwork, and showering soon after returning indoors.
Rabies exposure remains another concern this season. According to IDPH, two bats tested positive for rabies in Illinois so far in 2026, including cases in Whiteside and Sangamon counties. Officials said residents should avoid direct contact with bats and contact animal control if one enters a home.
People bitten by any animal should seek immediate medical attention, especially if rabies exposure is possible.
