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The Iowa Department of Health and Human Services has reported the first positive case of West Nile virus of the year in an adult in northern Iowa.

The state agency, in announcing the case Thursday, said mosquitoes across the state have tested positive for the virus, signaling a risk to Iowans.

One of those positive mosquito detections was in Johnson County. The county’s public health department announced a positive detection on Thursday.

Johnson County’s Mosquito Surveillance program, operated as a partnership between public health and Iowa State University Extension and Outreach, received the positive sample from the testing week of July 27-Aug. 2.

Rob Thul, environmental health manage

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