ABSTRACT
This study was carried out on total of 1184 patients presented with gastroentersis attending Baghdad teaching hospital ad Ai-Mansoor teaching hospital from June b2000 to10 May 2001. The study was perfumed to find the incidence of Entamoeba histolytica infection among gastroenteritis cases on the bases of the presence or absence of ingested RBCs in the trophozoite stage. Diagnosis was based on clinical and laboratory tests including stool occult blood test, macro and microscopic stool examination was carried out to determine the presence of blood, pus, mucus and parasites Two hundred and twelve out of 1184 patients were infected with morphologically identical E. histolytica trophozoites, 144 [28.2%] of them were hematophagous trophozoites. Stool occult blood tests were positive in 107[74.3%] out of patients with hematophagous trophozoites and 10 [14.7%] non-hematophagous trophozoite