First Human Case of West Nile Virus in Cook County

CHICAGO — The Cook County Department of Public Health officials have reported 2016's first human case of West Nile virus in suburban Cook County.

A woman in her 50s from the northwest suburbs—no specific town disclosed—became ill in late July. Testing of mosquito pools have found mosquitos carrying WNV in 57 communities in Cook County, the department says.

Most people hit with WNV show no symptoms of illness or never become ill, but for some, symptoms of fever, headache, and body aches can start 3–15 days after an infected bite.

People of any age can be affected by WNV, but those over 50 and those with a chronic disease might be at higher risk for complications such as encephalitis or meningitis.

Those who experience high fever, confusion, muscle weakness, severe headaches, or a stiff neck should see a doctor immediately.