1. Department of Poultry Diseases, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
2. Department of Virology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
3. Department of Hygiene and Zoonoses, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
4. Department of Pharmacology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
5. Department of Pathology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt