ILLINOIS — State health officials are raising awareness after West Nile Virus-positive mosquitoes were detected in 17 Illinois counties, a significant increase from the 13 reported around the same time last year.
While no human infections have been reported so far in 2025, officials caution that the risk of transmission is rising, particularly in warmer months when mosquito activity peaks. Residents in affected regions — including Henry, Bureau, and McDonough counties near the Quad Cities — are being asked to take proactive steps to reduce exposure.
“We’re seeing early signs that this could be an active season,” said a spokesperson for the Illinois Department of Public Health (IDPH). “Even without human cases yet, the presence of the virus in mosquitoes is a clear warning.”
Why West Nile Remains a Serious Concern
West Nile Virus is transmitted through the bite of an infected mosquito, and while many cases are mild or asymptomatic, the disease can be severe — especially for older adults and individuals with compromised immune systems.
In 2024, 13 people in Illinois died from the virus — the highest toll since 2018.
According to IDPH surveillance data, the virus typically circulates from late spring through early fall, with peak activity between July and September.
Precautions for Residents Across Illinois
Health authorities recommend the following steps for residents to protect themselves and help prevent the spread of the virus:
-
Eliminate standing water around your home (birdbaths, gutters, plant saucers)
-
Use insect repellent that contains DEET, picaridin, or oil of lemon eucalyptus
-
Wear long sleeves and pants during dawn and dusk, when mosquitoes are most active
-
Report dead birds or stagnant water to your local health department
Communities should also ensure storm drains and catch basins are not clogged, as these are common mosquito breeding areas.
For more prevention guidance, visit the official IDPH West Nile page.
What to Watch For: Symptoms of West Nile Virus
Most people infected with West Nile Virus do not feel sick. However, about 1 in 5 people may develop symptoms such as:
-
Fever
-
Headache
-
Body aches
-
Nausea or vomiting
-
Skin rash
In rare cases, the virus can lead to neurological complications, including encephalitis or meningitis.
If you or someone you know begins to experience severe headache, neck stiffness, disorientation, or muscle weakness after a mosquito bite, seek medical attention immediately.
Have you noticed increased mosquito activity or dead birds in your area? Report your observations and help raise local awareness at ChicagoSuburbanFamily.com.
