MILWAUKEE, Wis (Civic Media) — Two human cases of West Nile virus have been reported in Milwaukee, prompting health officials to urge residents to take precautions against mosquito bites.

The City of Milwaukee Health Department confirmed the cases, which are the first human infections reported in the city this year. Several other cases have been documented across Wisconsin in 2024, including two deaths and one hospitalization earlier in the season.

Around the state, Winnebago County officials confirmed their first human case recently of West Nile Virus, with Manitowoc County officials also releasing information about a case there as well.

West Nile virus is primarily transmitted to humans through the bite of infected mosquitoes. Most people infected with the virus do not develop symptoms, but about 20% may experience fever, headache, body aches, and fatigue.

In rare cases, West Nile virus can cause severe illness, particularly in older adults and those with weakened immune systems. Symptoms of severe infection can include high fever, neck stiffness, disorientation, and coma.

Wisconsin has seen an average of 18 cases of West Nile virus annually in recent years. In 2023, the state reported 25 confirmed and probable cases.

Health officials advise residents to take steps to prevent mosquito bites, including:

Using insect repellent containing DEET, picaridin, or oil of lemon eucalyptus
Wearing long sleeves and pants when outdoors
Eliminating standing water around homes to reduce mosquito breeding sites
Ensuring window and door screens are intact

The risk of West Nile virus transmission typically peaks in August and September but can continue until the first hard frost.

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