Ehrlichiosis: Symptoms & Signs

Medically Reviewed on 7/15/2021

Ehrlichiosis is a tick-borne disease of humans and animals.

Signs and symptoms of ehrlichiosis are very similar to those of Rocky Mountain spotted fever. Associated symptoms and signs can include

Cause of ehrlichiosis

Infection with Ehrlichia organisms causes ehrlichiosis. Different types of ticks have been known to carry these organisms including Amblyomma americanum (Lone Star tick), Ixodes scapularis (black-legged tick), and Ixodes pacificus (Western black-legged tick) in the U.S. The causative organism is similar to the group of small bacteria known as Rickettsia, the same group as the organism that causes Rocky Mountain spotted fever. Ehrlichia organisms infect the white blood cells of the body.

Other ehrlichiosis symptoms and signs


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Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.