Materials and Methods: To identify intestinal protozoan parasites among restaurant workers in Tabriz (East Azerbaijan province), Iran, in 2013, stool specimens were collected and examined from a total of 100 restaurant workers at the School of Veterinary Medicine, Islamic Azad University, Tabriz Branch. In the present study, the direct-smear examination, saline sedimentation, and Trichrome staining techniques were used.

Results: The positivity in the majority of them was single infection; however, 4 cases were double infection that constituted 1% of the prevalence. The prevalence of Entamoeba histolytica/dispor was 47.22%, Giardia lamblia 16.66%, and Entamoeba coli 36.11%. The double infection was only observed with E. histolytica/dispor and Giardia. The infection caused by these parasites was also accompanied by abdominal troubles, diarrhea, constipation, nausea, and vomiting.

Conclusion: These results lead to the understanding that sanitary measurements are not effective, and these hazardous situations facilitate the distribution of parasitic agents among consumers. The current pre-employment screening policies must be performed annually in order to be effective and systematic surveillance is needed in addition to health education.