Studies on infectious bursal disease gumboro in chickens in Egypt

studies about VVIBD in EgyptAcomprehensive involved: A. Study of the epidemiology of the infectious bursal disease. B. Characterization of the field isolates. C. Efficacy of thethe disease. commercial live vaccine to control A . The Epidemialagi’;al Study af the Disease: Within the examined seven governorates, includedfarm chicken types (broilers, native mixed, cOlmnercial layers and breeder type), belonged to eight breeds(Hubbard, Native Baladi, Brown Lohman Selected Leghorn, rSA-Babcock, Ross, Brown Hi-Lyne, White Lohman~SelectedLeghorn and Lohman boriler breeders). Fifteen selected chicken houses for the study with capacity range 4000-29000 chicks per house were chosen. The recorded results revealed that: