S. Abdelrahim, Jeddah I. E, E. .; E1, Selma,O.A, . J. .; A. Khalifa, K. .; M. Elnasri1 , Ballal, . I.; A. M1 , Amgad, M, A. . Incidence of Infectious Bursal Disease in Chickens Submitted to the Veterinary Research Institute (VRI), Khartoum-Sudan. vet 2022, 5.