Amoebiasis is a worldwide disease, particularly common in tropical countries and places where public hygiene and sanitation are poor. Amoebic infection is caused by an organism, Entamoeba histolytica (EH) which usually spreads through contaminated food and water. Since the causative organism of amoebiasis derives its nutrition from the normal bacterial flora of the large intestine, the latter is the chief site of infection. However, in some cases it may spread to other organs of the body, liver being the most susceptible to infection. Based on the site of the infection, the disease has been divided into intestinal and extra-intestinal amoebiasis.
Intestinal Amoebic Infection: During the acute phase of intestinal amoebiasis the patient may have loose motions, with or without mucus and blood, besides griping pain in the abdomen which may be severe at the time of evacuation. In chronic amoebiasis, a patient may complain of a dull pain in the lower abdomen, alternate constipation and diarrhoea, foul smell in the stools, formation of gases, and loss of appetite. Some people with amoebic infection may remain symptom-free or experience little discomfort but they may pass cysts in their stools (free cyst passers) and are potential carriers of the disease which spread it