Oakland County has identified its first probable human case of West Nile virus in 2026, health officials announced Thursday, Sept. 10.
The Oakland County Health Division did not release details about the patient, citing health privacy laws. Kate Guzman, health officer for the division, urged all Oakland County residents, including those in Northville and Novi, to guard against mosquito bites through the season's first hard frost.
"We strongly encourage residents to protect themselves from mosquitoes until the first hard frost of the year," Guzman said.
The case is the seventh mosquito-borne illness detected in a Michigan resident in 2026. Six were West Nile virus and one was Eastern Equine Encephalitis (EEE), a rarer disease that carries a 30% fatality rate among those who become ill. The EEE case was confirmed Aug. 19 in a Roscommon County resident, the state's first since 2021, according to the Detroit Free Press.
The virus has been spreading across southeast Michigan. Wayne County reported its first human case Aug. 26 in a suburban resident, according to MLive. Detroit confirmed its own case Sept. 4.
Michigan's first case of the year was detected in August through routine screening of a blood donation in Kent County, CBS News Detroit reported. By the end of June, the United States had recorded its earliest start to the West Nile season and the most cases by that point since 2004, according to Patch. The CDC has reported 407 West Nile virus cases nationally.
Most people infected with West Nile virus have no symptoms or experience mild illness such as fever, headache and body aches. In some cases, the virus can cause inflammation and swelling of the brain. Adults over 50 face the highest risk of serious illness, and no vaccine or specific treatment exists.
The health division recommends residents take these steps until the first hard frost, which typically arrives around late October in Michigan:
- Use EPA-registered insect repellent containing DEET, picaridin, IR3535, oil of lemon eucalyptus or PMD
- Empty standing water from tires, buckets, planters, birdbaths and pet bowls weekly
- Clean clogged roof gutters
- Wear long sleeves and pants outdoors
- Limit outdoor activity from dusk to dawn, when mosquitoes are most active
- Check window and door screens for holes
Residents can call the Oakland Connects Helpline at 800-848-5533, Monday through Friday, 8:30 a.m. to 5 p.m., or visit OakGov.com/Health for more information.
