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Abstract
The protozoan parasite, blastocystis hominis, has been studied by transmission electron microscopy in the stool samples of 320 patients. Various ultrastructural characteristics are noted and the incidence of this parasite infestation studied. The vacuolar form is the most common form. There is a strong correlation between the disease condition and the presence of blastocystis hominis (p<0.0001).The commonest infection was seen in patients having pruritis ani (54.2%) or carcinoma of the colon/rectum confined to the bowel wall or regional lymph nodes (53%) compared with patients having other intestinal diseases (30%). The implications of this finding with respect to colorectal cancer and the aetiology of this condition are discussed.
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