Overview
- DuPage County confirmed its first local human West Nile virus case of 2025 in a Glen Ellyn resident in their 50s who developed symptoms in mid-July.
- Officials raised the county’s Personal Protection Index from level one to level two in response to high mosquito infection levels and the new human case.
- Metropolitan Mosquito Control District testing found 25% of Twin Cities mosquito pools positive for West Nile virus, a July rate usually seen in late August, and Minnesota has recorded one human case.
- Health agencies in both states have intensified mosquito trapping, larvicide spraying and public advisories as peak transmission season unfolds.
- With no human vaccine available, residents are urged to use EPA-registered repellents, wear long protective clothing and eliminate standing water to reduce bite risk.