a form of ehrlichiosis that presents clinically as an undifferentiated acute febrile illness characterized by fever, chills, diarrhea, and headache, following tick bite(s), probably by the Lone Star tick, Amblyomma americanum. Usually caused by Ehrlichia chaffeensis. First described in 1987. (Thought to be predominantly a monocytic form of ehrlichiosis.)human granulocytotropic ehrlichiosis, human monocytotropic ehrlichiosis.
