the epidemiological survey of human intestinal parasites in rural areas of larijan

this survey was carried out from june to october 1990, in order to evaluate the prevalence of intestinal parasites in the residents. a total of 2227 persons were selected from 44 villages by using linear systematic sampling method. the samples of stool from these people were examined by formalin - ether concentration procedure. the collected data were analyzed by spss package. the result showed that 69.2% of the specimens were infected with intestinal parasites, which 58.4% of them were pathogenic (33.8% 16.9%, and 7.7% were infected with 1,2 and 3 species intestinal pathogen parasites respectively). infection rates with intestinal pathogen parasites was higher in mountains (71.4%) than plain areas (49.6%). and also higher in age groups 5-14 years (68.0%) than other age groups. the difference of the infection rates was nonsignificant between males and females. prevalence of different intestinal parasites was as follows: protozoa; e.coli 27.9% g. lamblia 17.2% i.butschlii 7/0% e.histolytica 5.9% e. hartmann 2.9% e. nana 2. 1% d. fragilis). 6% and c.. mesnili 0.4% helminths; t. trichiura 26. 8% a. lumbricoides 17.8% hook worm 8.9% s. stercoralis 8.5% e. vermicularis 3. 6% t.saginata 1. 4%, h.nana %1.0 and trichostrongylus sp. 0.7%