MILWAUKEE COUNTY, Wis. (CBS 58) -- Mosquitoes collected in Milwaukee County have tested positive for West Nile virus, marking the first confirmed activity of the virus in Wisconsin this year, the state Department of Health Services announced Tuesday, July 14.

A wild bird in Bayfield County also tested positive. No human cases have been reported so far in 2026.

"These first detections of West Nile virus this year serve as a reminder to take simple steps that can protect you and your family against possible illness," said Paula Tran, state health officer and administrator of the Division of Public Health.

Most people infected with the virus, which spreads through mosquito bites, do not develop symptoms. Those who do may experience fever, chills, headache and fatigue, while some develop more severe illness involving confusion, tremors, paralysis or seizures.

Wisconsin reports an average of 19 human cases each year, with most illnesses occurring in August and September. DHS recommends using bug repellent, wearing long sleeves and pants outdoors, and eliminating standing water around homes to reduce mosquito breeding.

For more information about West Nile and how to prevent it, click here.