1. Department of Microbiology and Parasitology, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia;
2. Department of Virology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafelsheikh, Egypt;
3. Department of Veterinary Public Health, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia;
4. Food Control Department, Faculty of Veterinary Medicine, Zagazig University, Al Sharqia Governorate, Egypt;
5. Department of Pathology, College of Veterinary medicine, King Faisal University, Saudi Arabia;
6. Department of Pathology, College of Veterinary Medicine, Suez Canal University, Ismailia Governorate, Egypt