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; Kafrelsheikh Egypt
3. School of Public Health; The University of Hong Kong; Hong Kong China
4. Department of Clinical studies, College of Veterinary Medicine; King Faisal University; Al-Hasa Saudi Arabia