What is Amebiasis?
It is a parasitic infection caused by the protozoa (single-celled organisms), Entamoeba histolytica. The infection only affects humans and is excreted through the feces (poop) of infected people.
What are the symptoms of amebiasis?
- Most people who become infected have no symptoms, but they carry the parasite, and can pass it onto others.
- 10-20% of people who become infected have symptoms, which include diarrhea (sometimes with blood and mucous), stomach pain or cramping, and constipation.
- In rare circumstances, it can affect other parts of the body like the liver, lungs and brain.
When do symptoms of amebiasis start?
People who do become sick usually develop symptoms in two to four weeks, though it can sometimes take longer.
How is amebiasis spread?
The infection can occur when a person:
- Puts anything into their mouth that has touched the feces of a person who is infected.
- Swallows something, such as food or water, that is contaminated with the parasite.
- Swallows the parasite's cysts (eggs) picked up from contaminated surfaces or fingers.
How is amebiasis treated?
Antibiotics are available for treatment. Your healthcare provider will decide the treatment that is right for you.
How is amebiasis prevented?
- Frequent and thorough handwashing is the best way to prevent infection.
- Handwash with soap and water after using the toilet, after changing diapers or cleaning feces, before and after preparing food, and after sexual contact.
- Dispose of human feces in a clean way and do not use it as a fertilizer.
- Drink water that you know is clean and safe; when there is a concern that water may be contaminated, make water safe for drinking by boiling, chemical disinfection, or filtration (e.g., when using a well or private water source, travelling, camping, etc.)
- Wash all fruits and vegetables thoroughly with clean water prior to eating, especially if eating them raw.
- Practice safe sex (e.g., condoms, dental dams) and avoid sexual practices that cause fecal-oral transmission.
- Do not use recreational water venues (e.g., swimming pools or water parks) until treatment has been completed and diarrhea has resolved.
Where can I get more information about amebiasis?
Contact the Communicable Disease Control (CDC) Program at 705-474-1400, or toll-free at 1-800-563-2808, ext. 5229 or email us at cdc@healthunit.ca.
References:
- Centre for Disease Control. (2025). Parasites - Amebiasis - Entamoeba histolytica infection: General Information.
- Heymann, David L. (2022). Control of Communicable Diseases Manual. 21st ed. P.2-6.
- Ministry of Health. (2023). Infectious Diseases Protocol, Appendix 1: Amebiasis.
Created: Feb. 2026, by CDC