1. Pediatric Infection Research Center, Research Institute for Children Health, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2. Department of Microbiology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, IR Iran
3. Department of Microbiology, Milad Hospital, Tehran, IR Iran
4. Department of Pathology, Labbafinejad Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
5. Foodborne and Waterborne Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshsti University of Medical Sciences, Tehran, Iran
6. School of medicine, Shahroud University of Medical Sciences, Shahroud, Iran