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Ehrlichiosis is a disease transmitted by a tick infected with Ehrlichia organisms. Symptoms include fever, headache and nausea. The disease is treated with antibiotics and recovery is expected.

Review Date 9/27/2017

Updated by: Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School; Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital, Boston, MA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.