Wheaton, IL – The first human case of West Nile virus (WNV) in 2025 has been reported in DuPage County, with a Glen Ellyn resident in their 50s diagnosed earlier this month. The onset of symptoms occurred in mid-July, prompting renewed public health warnings as mosquito activity remains high throughout the region.
According to the DuPage County Health Department (DCHD), the infected individual began experiencing symptoms such as fever, headache, joint pain, and fatigue, which are common indicators of West Nile virus. The department noted that most people infected with WNV do not feel sick, but approximately one in five may develop symptoms. Less than one percent of infected people may suffer serious neurological complications, including encephalitis or meningitis.
Recent testing has shown an increase in mosquito batches testing positive for WNV throughout DuPage County. Public health officials are urging residents to take steps to minimize mosquito exposure while outdoors. According to the DCHD, the best ways to prevent WNV infection are to reduce standing water where mosquitoes breed, use insect repellent, and report areas where water sits for more than a week.
There are currently no vaccines or specific treatments available for WNV in people. The department recommends following the “3Rs” to help protect against the virus: Reduce mosquito populations by eliminating standing water, Repel mosquitoes by using insect repellent, and Report stagnant water to local authorities.
Residents are encouraged to monitor the county’s Personal Protection Index (PPI) for up-to-date information on WNV activity. The PPI level was raised to 2 this week, indicating high numbers of infected mosquitoes and at least one confirmed human case in most areas of DuPage County. Updates are posted every Wednesday during the WNV season.
For more information, visit the DuPage County Health Department website or consult CDC and Illinois Department of Public Health resources.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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