Amoebiasis (patient information)

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What is Amoebiasis?

Amoebiasis is an infection of the intestines caused by the parasite Entamoeba histolytica.

What are the symptoms of Amoebiasis?

Usually, the illness lasts about 2 weeks, but it can come back if treatment is not given.

Mild symptoms:

    • Passage of 3 - 8 semiformed stools per day

Severe symptoms:

    • Passage of 10 - 20 stools per day

Note: In 90% of people with amoebiasis there are no symptoms.

What causes Amoebiasis?

Entamoeba histolytica can live in the large intestine (colon) without causing disease. However, sometimes, it invades the colon wall, causing colitis, acute dysentery, or long-term (chronic) diarrhea. The infection can also spread through the blood to the liver and, rarely, to the lungs, brain or other organs.

This condition can be seen anywhere in the world, but it is most common in tropical areas with crowded living conditions and poor sanitation. Africa, Mexico, parts of South America, and India have significant health problems associated with this disease.

Entamoeba histolytica is spread through food or water contaminated with stools. This is common when human waste is used as fertilizer. It can also be spread from person to person -- particularly by contact with the mouth or rectal area of an infected person.

Risk factors for severe amoebiasis include:

  • Old age
  • Recent travel to a tropical region

In the United States, amoebiasis is most common among those who live in institutions and people who have anal intercourse.

How do I know I have Amoebiasis?

Examination of the abdomen may show liver enlargement or tenderness in the abdomen.

Tests include:

  • Microscope examination of 3 stool specimens several days apart

When to seek urgent medical care

Call your health care provider if you have persistent diarrhea.

Prevention of Amoebiasis

When traveling in tropical countries where poor sanitation exists, drink purified or boiled water and do not eat uncooked vegetables or unpeeled fruit. Public health measures include water purification, water chlorination, and sewage treatment programs.

Safer sex measures, such as the use of condoms and dental dams for oral or anal contact, may help prevent infection.

Treatment options

Where to find medical care for Amoebiasis

Directions to Hospitals Treating Amoebiasis

What to expect (Outlook/Prognosis)

Possible complications

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