Infectious bursal disease virusBirnaviridae InfectionsBursa of FabriciusPoultry DiseasesReoviridae InfectionsChickensViral Structural ProteinsReoviridaeBirnaviridaeViral VaccinesSpecific Pathogen-Free OrganismsCapsid ProteinsChick EmbryoFowlpox virusCapsidAntibodies, ViralSaskatchewanAntigens, ViralRNA, Double-StrandedVirus ReplicationVirus AssemblyVirulenceMolecular Sequence DataRNA, ViralViral ProteinsBaculoviridae