RESUMEN
To determine the prevalence of parasitic infections in people referred to Kashani Hospital Tehran during Summar season in 2005. Fecal samples were examined by direct examination, formalin-ether concentration and staining with Ziehl-Neelsen. To identify Strongyloides stercoralis samples were cultured on the nutrient agar medium. In a total of 205 cases examined 29.75% were found infected with at least one parasite. The rates was as follows: Blastocystis hominis 20.9%, Giardia lamblia 5.36%, lodamoeba butschelii 0.48%, Dientamoeba fragilis 0.48%, Trichomonas hominis 0.48%, Endolimax nana 0.97%, Enterobius vermicularis 0.48% and Taenia 0.48%. Results included the significance of Giordia infection in children along with symptoms. 76.74% of patients with Blastocystis infection have presented with intestinal symptoms. More research is encouraged to identify the relationship of B. hominis and the symptoms