Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 26 3-4 1997 12 15 43 52 M.H. Salari 2015 10 03 Acute infectious gastroenteritis is one of the most common infectious diseases of humans in the world. Diarrhea is a significant cause of death in infants. It has been estimated that up to 15% of children in developing nations die of diarrhea before 3 years of age. This study has been carried out to investigate entheropathogenic bacteria from 558 specimens of children less than 5 years of age. The results were obtained as follow: 1-Anaerobic bacteria: Toxigenic (Clostridium difficile 2 cases (3.6 percent) (Associated with bacterial Toxins) and Enterotoxigenic clostridium per/linens, was not seen. 2- Microaerophilic bacteria: Cainpylobacterjejunj 8 cases (14.5 percent). 3- Facultative bacteria: Salmonella Typhimuriuni 4 cases (7.3 percent) and Salmonella havana 1 case (1.8 percent). Shigella dysenreriac 4 cases (7.3 percent); Shigella flexneri 8 cases (14.5 percent); Shigella boydii 1 case (1.8 percent) and Shigella sonnei 7 cases (12.7 percent). Escherichia coli 13 cases (23.6 percent). Yersinia enteroco/jtjca and Vibrio cho/erac were not seen, Aerornonas hydrophila 6 cases (10.9 percent) and Plesiomonas shigelloides 1 case (1.8 percent). https://ijph.tums.ac.ir/index.php/ijph/article/view/1791 https://ijph.tums.ac.ir/index.php/ijph/article/download/1791/1772