1. Laboratory of Molecular Epidemiology, Faculty of Veterinary Medicine, Cairo University, Egypt
2. Department of Medicine and Infectious Diseases, Faculty of Veterinary Medicine, Cairo University, Egypt
3. Agricultural Research Service, USDA, Beltsville, MD, USA
4. Department of Veterinary Public Health, College of Veterinary Medicine, University of Mosul, Mosul, Iraq
5. Landesbetrieb Hessisches Landeslabor, Giessen, Germany
6. Endoscopy Unit, Department of Internal Medicine, Faculty of Medicine Kasralainy, Cairo University, Egypt
7. Department of Microbiology and Immunology, Faculty of Medicine, King Abdul Aziz University, Saudi Arabia
8. Department of Microbiology and Immunology, Faculty of Medicine, Ain Shams University, Egypt