A survey based upon a study of single stool specimens from 300 students in the vicinity of Dacca, East Pakistan, indicates the occurrence of parasites and intestinal fauna in this general area. Entamoeba histolytica, E. coli and Endolimax nana were prevalent, supporting observations indicating that the people, in general, live in an environment which permits effective transmission of certain parasites. The small, non-pathogenic race of E. histolytica was much more common than the larger race. Balantidium coli and Isospora were uncommon with a single infection detected for each. Hookworm, Ascaris and Trichuris occurred in a high percentage of the population and eggs of Hymenolepis nana were found in a single stool. An unidentified acanthocephalan was recorded as well as a single infection with Fasciolopsis and Diphyllobothrium, and three with Haplorchis taichui. All persons studied possessed at least one species of parasite.