History and Objectives: Due to importance of the intestinal parasite in the personal as well as social hygiene and role of producers and distributors of the food stuff in the spread of the infection and in light of variation of the spread of the disease in the country and lack of accurate epidemiological data in Kashan, this study was conducted in 1996.

Materials and Methods: The present study is a descriptive analysis of total population of 2010 subjects of various food producers and distributors. Type of vending activity was recorded and after necessary instructions, 2 fecal samples were collected from each individual and analyzed by microscopic direct examination and formalin-ether method.

Results: The prevalence of the infection in the population was 54.4%. The prevalence of Giardia lamblia, Entamoeba histolytica, Himonolypis nana and ascaris was 16.3%, 5.2%, 1% and 0.9% respectively. Maximum rate of infection of Giardiasis (20.6%) and Ascaris (5.3%) were in food factory workers and histolytica (9.1%) and Himonolypis nana (2.4%) in fast food restaurant workers.

Conclusion: The investigation points out to the fact that the prevalence of single cell parasitic agents is high in the population studied. Therefore, it is recommended that factor contributing to the high prevalence of infection be identified and preventive measures are undertaken to reduce prevalence of infection.