Illinois' first West Nile virus-related death of 2025 was confirmed in Cook County today, according to an Illinois Department of Public Health press release.

"The year's first death from West Nile virus in Illinois is a sobering reminder that mosquito-borne illnesses are still with us," IDPH Director Dr. Sameer Vohra said in the release. “It’s important to take appropriate precautions as the weather remains warm."

Here's what we know.

West Nile virus death reported in Cook County, Illinois

The individual was a suburban Cook County resident in their 60s, according to the release.

Laboratory testing confirmed West Nile virus was a contributing factor to the resident’s death.

What is West Nile virus?

West Nile virus is transmitted through the bite of a Culex mosquito, or house mo

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