1. Department of clinical studies, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia
2. Department of Veterinary Services, Ministry of Environment, Water and Agriculture, Riyadh, Saudi Arabia
3. Department of Virology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt
4. Department of Pathology, Animal Health Research Institute, Dokki, Cairo, Egypt
5. Department of Pathology, Veterinary Diagnostic Laboratory, Ministry of Environment, Water and Agriculture, Al-Hasa, Saudi Arabia
6. Department of Anatomy, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia
7. Department of Microbiology, College of Veterinary Medicine, King Faisal University, Al-Hasa, Saudi Arabia