Ehrlichiosis is a disease caused by the bacteria Ehrlichia chaffeensis which infects white blood cells (monocytes). Ehrlichia was previously known as human monocytic ehrlichiosis (HME). Signs and symptoms of ehrlichiosis include: fever, headache, nausea, and body aches. Encephalitis/ meningitis may occur. Ehrlichiosis is transmitted to a person through the bite of an infected lone star tick (Amblyomma americanum).

Ehrlichiosis is uncommon in Maine, due to the fact that the lone star tick is uncommon in Maine. Ehrlichiosis is treatable, and is best prevented by avoiding exposure to ticks.

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Resources for Maine Residents

Surveillance Reports

Other Vector-borne Diseases