Iowa Health and Human Services has confirmed the state’s first human case of West Nile virus this year.
The infection was identified in an eastern Iowa adult between 18 and 40 years old and confirmed through testing at the State Hygienic Laboratory.
West Nile virus is primarily spread through the bite of an infected mosquito. Mosquito testing has also detected the virus in Iowa this season, confirming a risk of infection.
Iowa HHS recommends using an insect repellent containing DEET, picaridin, oil of lemon eucalyptus or another approved active ingredient. When using sunscreen, apply the sunscreen first and insect repellent second.
Oil of lemon eucalyptus should not be used on children younger than 3, while DEET should not be used on infants younger than 2 months.
Additional precautions include wearing long sleeves and pants when practical, repairing damaged window and door screens, and regularly emptying standing water from buckets, tires, pet dishes and other containers.
Many people infected with West Nile virus experience no symptoms. Others may develop a fever, headache or body aches. Anyone experiencing a severe headache, disorientation or sudden muscle weakness should seek immediate medical attention.
Iowa recorded 57 human cases and three deaths from West Nile virus in 2025.