DUPAGE COUNTY, Ill. - Mosquitoes in DuPage County tested positive for West Nile virus last month, health officials announced Thursday.

The infected mosquito pools were collected May 27 in Roselle, Medinah, Clarendon Hills and Burr Ridge. Though no human cases have been reported so far in 2025, health officials said the presence of West Nile-positive mosquitoes signals increased risk and are urging residents to take precautions.

As a result, the county’s Personal Protection Index — which tracks West Nile activity from zero to three — has been raised from level zero to level one.

What you can do:

Officials recommend residents follow the "3 R’s" to fight the bite: reduce standing water, repel with insect repellent and report stagnant water concerns to the Health Department.

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