Michigan Man Contracts Deadly EEE Virus After 5 Years

Michigan has confirmed its first human case of Eastern equine encephalitis (EEE) in five years, with the diagnosis occurring in a Roscommon County resident. This case may also be the first reported human EEE infection in the United States for 2026. Health officials emphasize EEE's significant danger, noting a 30% fatality rate among infected individuals.

An EEE outbreak in Michigan during 2019 led to ten human cases, six of which were fatal, alongside 46 animal cases. While EEE can affect both animals and humans, no animal-related cases have been confirmed in Michigan this year as of Wednesday. However, domestic horses in Michigan experienced confirmed EEE cases in 2023, 2024, and 2025. State and local health departments are increasing surveillance in Roscommon County, including enhanced mosquito trapping and testing.

Symptoms of EEE can include fever, headache, chills, and nausea, potentially progressing to brain inflammation. Public health guidance strongly advises avoiding mosquito bites through measures like using EPA-registered insect repellents and wearing protective clothing outdoors. Residents are also urged to eliminate potential mosquito breeding sites around their homes by regularly cleaning water-holding containers.