Amoebiasis is a disease caused by a single-celled parasite called Entamoeba histolytica. Entamoeba histolytica is the third leading cause of morbidity and mortality due to parasitic disease in humans (after malaria and schistosomiasis) and is estimated to be responsible for between 50,000 and 100,000 deaths worldwide every year. It is a tiny single celled creature, 10 to 40 milli microns in diameter. It is normally a resident of large intestine of man. While it remains free in the intestines, the person is symptom less, but when it invades the mucous membrane of later, it gives rise to...