Home / Health / Illinois Mosquitoes Test Positive for West Nile Virus
Illinois Mosquitoes Test Positive for West Nile Virus
5 Aug
Summary
- West Nile virus found in Riverwoods, Illinois mosquitoes for first time this year.
- Positive tests also reported in Glenview, Wilmette, Roselle, Glendale Heights, Wheaton.
- Prevent bites by using repellent, eliminating standing water, and wearing protective clothing.

Mosquitoes in Riverwoods, Illinois, have tested positive for the West Nile virus, marking the first detection of the year. The North Shore Mosquito Abatement District confirmed the positive results from mosquitoes collected on August 3.
This detection follows similar positive tests in several other suburbs, including Glenview, Wilmette, Roselle, Glendale Heights, and Wheaton. While most infected individuals do not show symptoms, about 20% develop flu-like symptoms. The peak season for West Nile virus infection is typically from late August to early September.
Public health officials emphasize that preventing mosquito bites is the most effective way to avoid the virus, as it does not spread from person to person. Recommended preventive measures include using insect repellent, removing standing water around homes, keeping grass and weeds trimmed, wearing protective clothing, and ensuring window and door screens are intact.