1. Department of Animal Wealth Development, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
2. Department of Virology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
3. Clinical Pathology Department, Faculty of Veterinary Medicine, Benha University, Benha, Egypt
4. Avian and Rabbit Diseases Department, Faculty of Veterinary Medicine, Sadat City University, Sadat City, Egypt
5. Research and Development Section, PerNaturam GmbH, Gödenroth, Germany