1. Faculty of Veterinary Medicine Department of Virology Mansoura University Mansoura Egypt
2. Faculty of Veterinary Medicine Department of Pathology Mansoura University Mansoura Egypt
3. Researcher of Poultry Diseases Reference Laboratory of Quality Control of Poultry Production (Gamasa) Animal Health Research Institute Mansoura Egypt
4. Faculty of Veterinary Medicine Department of Poultry Diseases Mansoura University Mansoura Egypt