Try not to scratch that mosquito bite. 

SPRINGFIELD — The Centers for Disease Control and Prevention has agreed to investigate a confirmed case of West Nile virus in Illinois.

The Illinois Department of Public Health says Wednesday the state saw its first human case of the virus for 2018 in mid-May. The case occurred earlier in the season than usual, prompting the department to call on the CDC for further testing.

The first confirmed case for 2017 occurred in mid-July. The state saw 90 human cases of the virus last year, including eight deaths.

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West Nile is spread through the bite of an infected mosquito. Often there are no symptoms, but those older than 60 are more likely to die or to develop a severe illness.

The Department of Public Health suggests people to stay alert and use insect repellent when outside.

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