1. Department of Zoonoses, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt.
2. Department of Bacteriology, Immunology and Mycology, Faculty of Veterinary Medicine, Benha University, Benha, Egypt.
3. Department of Food Hygiene, Animal Health Research Institute, Mansoura, Egypt.
4. Department of Microbiology, Animal Health Research Institute, Mansoura, Egypt.