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First Human West Nile Virus Case Confirmed in Illinois

The CDC verified a hospitalized individual from southern Illinois as the state's initial human infection with West Nile virus reported in 2025.
This case occurred more than three weeks earlier than usual, marking the earliest onset of illness in Illinois since 2016.
West Nile virus has been identified in mosquitoes across 19 counties in Illinois, beginning with an initial positive mosquito sample collected in Rockford on May 9.
Approximately 20% of infected people develop fever or flu-like symptoms, while about one in 150 may experience severe illness such as brain or nerve involvement.
Health officials urged Illinois residents, especially seniors and immunocompromised persons, to take precautions and 'Fight the Bite' to reduce infection risk.

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Illinois health officials confirm state’s first human West Nile case of the year

SPRINGFIELD — The first human case of West Nile virus in Illinois has been confirmed by the U.S. Centers for Disease Control, according to the Illinois Department of Public Health.

9 days ago·Cherokee County, United States

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Daily Journal

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Illinois Reports First West Nile Virus Case of 2025

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9 days ago·Cherokee County, United States

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Public health officials confirm state's first human West Nile case of ...

10 days ago

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WCIA 3 News

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Illinois records first human case of West Nile Virus this year

ILLINOIS (WCIA) — In Illinois, one community just confirmed their first human case of West Nile virus (WNV) in 2025, while another community said they positively identified their first batch of mosquitos with WNV this year. The Center for Disease Control and Prevention confirmed that a person from Southern Illinois was hospitalized for WNV. According […]

10 days ago

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