Amoebiasis diarrhoea: what patients should know

The infection is caused by the parasite Entamoeba histolytica. Some infected people have no symptoms, while intestinal disease may produce loose stools that become frequent or contain blood and mucus. A stool test and clinical assessment help distinguish it from other causes of diarrhoea.

Amoebiasis spreads when material contaminated with stool is swallowed, often through unsafe food, water or hands. The parasite can remain in the intestine without causing illness, but it may invade the bowel lining and trigger pain, urgency and dysentery. Diarrhoea alone cannot identify amoebiasis because many infections and non-infectious problems cause the same symptom.

Fluid loss matters even before the cause is confirmed. Thirst, a dry mouth, reduced urination, dizziness and unusual tiredness can indicate dehydration.

Sip oral rehydration solution prepared exactly as its packet directs. Continue fluids and simple foods as tolerated, and use safe drinking water. Wash hands with soap after using the toilet and before handling food; avoid preparing meals for other people while diarrhoea continues.

Arrange a clinical review if amoebiasis is suspected, particularly after travel or possible exposure to unsafe food or water. Do not take leftover antibiotics or anti-diarrhoeal medicine without advice. Treatment depends on the diagnosis, and medicine that slows the bowel may be unsuitable when stools are bloody.

Seek urgent medical care for blood in the stool, severe or worsening abdominal pain, persistent vomiting, confusion, fainting, very little urine or inability to keep fluids down. Fever with marked weakness also deserves prompt assessment. Infants, older adults, pregnant people and anyone with reduced immunity can become unwell more quickly and should seek advice early.

Call local emergency services if the person is difficult to wake, collapses or has signs of severe dehydration. Rarely, amoebiasis can spread beyond the bowel and cause fever with pain in the upper right abdomen.

Ask whether a stool sample is needed, how to collect it, and whether your travel, water or food history changes the testing plan. Clarify how to replace fluids, which medicines to avoid, what prescribed treatment is intended to clear, and whether follow-up testing is appropriate. Mention bloody stools, fever, pregnancy, liver disease, reduced immunity and every medicine or supplement you take.