E. . S. Abdelrahim, Jeddah I. E, . J. . E1, Selma,O.A, K. . A. Khalifa, . I. M. Elnasri1 , Ballal, and A. . A. M1 , Amgad, M, “Incidence of infectious bursal disease in chickens submitted to the Veterinary Research Institute (VRI), Khartoum-Sudan”, vet, vol. 5, no. 2, Oct. 2022.