1. Department of Poultry Diseases, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt
2. Department of Immunology, Animal Health Research Institute Agricultural Research Center (ARC), Giza, Egypt
3. Department of Pathology, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt
4. Department of Veterinary Hospital, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt
5. Department of Virology, Faculty of Veterinary Medicine, Cairo University, Cairo, Egypt