Yersinia enterocolitis causes a wide spectrum of human diseases including gasteroentritis, which is the most frequent of its manifestation. Other diseases and clinical syndromes resulting from Yersinia enterocolitica are septicemia, mesenteric lymphadenitis, apendisitis, exudative pharyngitis, reactive artiritis, nodosum erythema and rarely Reiter's syndrome. In many countries such as western European, Scandinavian and north American countries, Australia and Japan the role of Yersinia enterocolitica particularly the 0:3, 0:8 and 0:9 serotypes in human diseases have been clearly identified. In spite of significant development in the field of separating Yersinia enterocolitica from feces as well as from the environmental specimens during the last decade, there has been only one documented report of isolating Yersinia enterocolitica in Iran in 1977. Thus we decided to test 300 samples of feces within 5 months. In this method, CIN agar as a selective and special medium and Mac conkey agar as classic medium were used. Also cold enrichment method in PBS (pH=7.8) was used. In order to determine importance of enterocolitica, we separated other pathogens of intestine such as salmonella, shigella and entropathogenic E.Coli. The achieved results from abundance points of view are as follows: 17 strains of EPEC (5.66%), 9 strains of shigella (3%), 8 strains of Yersinia enterocolitica (2.66%) and 6 strains of salmonella (2%)