| Summary: | The prevalenee of intestinal helminths was determined by stool examination of the inhabitants of two mountainous areas in the northeast (Torghabeh) and northwest (8asmenge) of Iran. All members of 20% of the families from 10 villages of Torghabeh amounting to 18 I 2 persons, and 10% of families from 23 villages of Basmenge to 10 I 7 individuals were chosen by stratified sampling method and were examined, and the intensity of infection was determined by egg count. The highest rates of infection were found for ascaris (74% and 81%) in both areas. Then T. trichiura (with a prevalence of 21% and 37%) and H. nana (4% and 8%), were more prevalent infections detected. In Basmenge 57% were infected with one, and 37% with two and 1% with three species of helminths and ouly 8% were free from infection, while in Torghabeh 60% had one, 16% had two, and I% had 3 worms, and their differences discussed. These data are compared with those from other parts of Iran and their differences discussed.
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