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[Ehrlichiosis: a new infectious disease].

Human ehrlichiosis is transmitted by ticks. For the first time it was described in 1987. The ethiologic agent is Ehrlichia chaffeenisis. The course of the disease may be mild, self-limited or sometimes severe finishing with dead. The main symptoms are: fever, leucopenia, thrombocytopenia, or pancytopenia. Tetracyclines are mostly efficient in the treatment.