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Human ehrlichiosis

a form of ehrlichiosis that presents clinically as a undifferentiated acute febrile illness characterised by fever, chills, diarrhoea, and headache, following tick bite(s), probably by the lone star tick, amblyomma americanum. Caused by ehrlichia chaffeensis. First described in 1987. (Thought to be predominantly a monocytic form of ehrlichiosis.)