Anaplasmosis: Symptoms & Signs

Medically Reviewed on 7/12/2021

Anaplasmosis is a tick-borne disease. The condition affects people of all ages who are exposed to tick bites. The majority of cases have been reported in the U.S. during the summer months. It is most common in the upper Midwest and northeast regions of the U.S.

The condition was first recognized as a human disease in the 1990s. Signs and symptoms associated with anaplasmosis include

It has been reported to be fatal in less than 1% of cases.

Cause of anaplasmosis

The bacterium Anaplasma phagocytophilum causes anaplasmosis. The causative bacteria spreads to people by tick bites primarily from the blacklegged tick (Ixodes scapularis) and the western blacklegged tick (Ixodes pacificus).

Other anaplasmosis symptoms and signs


Bowel regularity means a bowel movement every day. See Answer

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