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Illinois Reports First West Nile Virus Death of the Year, in Chicago
Health officials say 80% of West Nile infections cause no symptoms as Chicago reports its first two human cases and first death of 2026.
On Tuesday, the Chicago Department of Public Health announced the city's first two human West Nile virus cases of 2026, with one patient confirmed dead.
CDPH Commissioner Garth Walker attributed the surge to weather, stating, "2026 has seen the rainiest summer in Chicago in years," which created ample breeding opportunities for mosquitoes.
While most infected individuals remain asymptomatic, about one in five develop fever and flu-like symptoms. Severe illness occurs in roughly one in 150 cases, disproportionately affecting older adults and the immunocompromised.
Spraying insecticide in 15 community areas in recent weeks, the department also recommends wearing protective clothing and using EPA-registered repellent to "Fight the Bite."
Illinois Department of Public Health Director Dr. Sameer Vohra reports additional cases statewide. The state recorded 150 human cases last year, significantly fewer than the 2002 record of 884 cases.