Eastern Equine Encephalitis

Culiseta melanura mosquito preparing to feed on a blue jay

Photo courtesy of the Connecticut Agricultural Experiment Station

EEE virus is a rare cause of brain infections (encephalitis). Only a few cases are reported in the United States each year. Most occur in eastern or Gulf Coast states. Approximately 30% of people with EEE die and many survivors have ongoing neurologic problems.

As of October 20, 2020, nine confirmed cases of EEE virus disease have been reported to CDC for the year. Cases were reported from Indiana (1), Massachusetts (4), Michigan (2), and Wisconsin (2).