First 2025 Human Case of West Nile Virus in Michigan

The first human case of West Nile virus in Michigan for 2025 has been confirmed in a Livingston County resident. This means the virus is active in our state, and now is the time to take steps to protect yourself from mosquito bites.

What is West Nile virus?
West Nile virus is spread by the bite of an infected mosquito. Many people never feel sick, but some may develop symptoms like fever, headache, tiredness, or muscle aches. In rare cases, it can cause serious illnesses such as meningitis or encephalitis. People over 60 are at higher risk for complications.

When is the risk highest?
Mosquito season in Michigan runs through the summer and early fall, with the highest risk in August and September.

How to protect yourself from West Nile virus:

• Use EPA-approved insect repellent with DEET, picaridin, IR3535, oil of lemon eucalyptus, or 2-undecanone.
• Wear long sleeves, long pants, and socks when outdoors.
• Avoid being outside during dusk and dawn, when mosquitoes are most active.
• Remove standing water from places like bird baths, tires, buckets, and gutters.
• Keep window and door screens in good condition.

Taking a few simple precautions can lower your risk of mosquito-borne diseases like West Nile virus, Eastern Equine Encephalitis (EEE), and Jamestown Canyon virus (JCV).

For more information, visit Michigan.gov/EmergingDiseases or the CDC West Nile Virus page.

Your health is no small matter—protect yourself and your family this mosquito season.