1Department of Poultry and Rabbit Diseases, Faculty of Veterinary Medicine, Cairo University, Egypt
2Department of Genetic Engineering, Veterinary Serum & Vaccine Research Institute (VSVRI), Agricultural Research Center (ARC), Cairo, Egypt
*Corresponding Author:
Shakal MA, Department of Poultry and Rabbit Diseases, Faculty of Veterinary Medicine, Cairo University, Egypt, Tel: 00201003939101 Email: