Sultan, H., Hussein, H. A., El-Razik, A. G. A., El-Balall, S., Talaat, S. M., & Shehata , A. A. (2012). Efficacy of HVT-IBDV Vector Vaccine Against Recent Egyptian vvIBDV in Commercial Broiler Chickens. International Journal of Poultry Science, 11(11), 710–717. https://doi.org/10.3923/ijps.2012.710.717