title: [Attenuation of infectious bursal disease virus by serial passage through chicken embryonated eggs and chicken and duck embryonic fibroblasts (author's transl)].
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis; D002642:Chick Embryo; D002645:Chickens; D004372:Ducks; D004531:Eggs; D004625:Embryo, Nonmammalian; D007243:Infectious bursal disease virus / Q000276:immunology / Q000472:pathogenicity*; D012087:Reoviridae / Q000472:pathogenicity*; D014774:Virulence; D014776:Virus Cultivation
chemical_list: D000914:Antibodies, Viral