Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 6 1 1977 03 15 24 29 F. Arfaa E. Kayvan E. Ghadirian G.H. Missaghian 2015 10 03 Prevalence of various intestinal helminthiasis has been established among the population of 42 villages in Gonbad Kavus in the north-east of the Caspian Littoral during a longitudinal health survey undertaken in this area. Stool examination by formaline ether technique been performed among 1240 randomly selected population. Surprisingly and contrary to most other areas in Iran; very low infection rate With Ascaris (0.2%), Trichostrongylus (1.2%), hookworm (2.4%) and Trichuris (0.2%) were foundt among the population. Prevalence of infection with Hymenolepis nana was rather high (overall prevalence. of 12.5%). Significant variation has only been observed in the prevalence of Hymenolepis nana in various age groups. Simultaneous infection with two or more helminths has been found in 16.5% of people and 9.6% were infected with one, worm. Infection with all helminths except Hymenolepis was very low in 20 villages where 20 or more people were examined. Strongyloides stercoralis with a maximum rate of infection of 4% was found among the population of 5 out of 20 villages. Dicrocoelium dendriticum was also found in 7 persons. Reasons for low prevalence of helminthiasis and its reverse correlation with the high incidence of 4 esophageal cancers in that area are discussed. https://ijph.tums.ac.ir/index.php/ijph/article/view/2740 https://ijph.tums.ac.ir/index.php/ijph/article/download/2740/2720