Amebiasis (Entamoeba histolytica Infection): Symptoms & Signs

Medically Reviewed on 1/4/2021

Amebiasis is an infection with a protozoan parasite known as Entamoeba histolytica (E. histolytica). In some people, the infection can lead to symptoms of dysentery (diarrhea with blood).

Only 10%-20% of infected people will show symptoms and signs. When symptoms and signs occur, these can include

Other associated symptoms can include

Causes of amebiasis

The infection spreads by consuming contaminated food or water, association with food handlers whose hands are contaminated, or contact with contaminated medical devices such as colonic irrigation devices. Amebiasis is contagious and can spread from person to person.

Other amebiasis 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.