Each year, late summer weather brings an increase in mosquito activity, and August and September are when West Nile virus (WNV) is most often detected. The Village of Carol Stream has been notified of a confirmed human case of WNV in the community. The Village is working closely with Clarke Mosquito Control to evaluate and treat breeding areas to help reduce the risk of further transmission.

The DuPage County Health Department (DCHD) has also confirmed the first WNV-related death in DuPage County for 2025. A resident in their 80s who became ill in August has passed away. To date, 11 human cases have been reported countywide. While the risk of severe illness remains low for most individuals, it is important for everyone to take precautions to protect themselves and help reduce mosquito populations.

In response to the DCHD’s report, the Village of Carol Stream coordinated with Clarke Mosquito Control to conduct a localized adult mosquito control application on Thursday, September 25, within a ¼-mile radius near St. Charles Road and S. President Street. Village staff and Clarke will continue monitoring mosquito activity, conducting additional testing, and applying treatments as necessary.

The best way to prevent WNV is to avoid mosquito bites and follow the “Three Rs” of defense. There are no vaccines or specific medicines to treat WNV in people.

• Reduce the number of mosquitoes, drain standing water around your home to prevent mosquitoes from breeding.
• Repel mosquitos by using insect repellent
  • Apply EPA-registered insect repellents containing 20% to 50% DEET (for adults) and 20% to 25% DEET (for children).
• Report areas where water sits for more than a week.
  • Report dead birds or other complaints regarding WNV, such as areas of stagnant water, through the DuPage County Health Department website.

Additional steps for personal protection:

• Limit outdoor activity during dusk and dawn, when mosquitoes are most active.
• Wear long sleeves and pants, and choose light-colored clothing.
• Keep mosquitoes outside by using tight-fitting window and door screens without tears or gaps.

For more information and resources, visit the DuPage County Health Department website:

• West Nile Virus Information
• Reduce Mosquito Breeding Sites & Report Bird Deaths
• Protect Yourself From Mosquito Bites
• Surveillance Maps
• Full DCHD News Release

The Village will continue to share updates as needed and remains committed to working with public health partners to protect the community.