1. 1 Inactivated Viral Poultry Vaccine Department (IVPVD), Central Laboratory for Evaluation of Veterinary Biologics (CLEVB) , Agricultural Research Center (ARC) , Cairo , Egypt
2. 2 Veterinary Serum and Vaccine Research Institute (VSVRI), Agricultural Research Center (ARC) , Cairo , , Egypt
3. 3 National Laboratory for Veterinary Quality Control of Poultry Production (NLQP), Animal Health Research Institute (AHRI), Agricultural Research Center (ARC) , Giza , Egypt