title: The effect of antigen variation on the quantitative agar gel precipitin test for antibodies to infectious bursal disease virus.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D000956:Antigens, Viral / Q000235:genetics / Q000276:immunology*; D002645:Chickens / Q000276:immunology; D000939:Epitopes / Q000276:immunology; D014644:Genetic Variation; D007114:Immunization; D005779:Immunodiffusion; D007243:Infectious bursal disease virus / Q000276:immunology*; D012087:Reoviridae / Q000276:immunology*; D013045:Species Specificity; D014613:Vaccines, Attenuated / Q000276:immunology*
chemical_list: D000914:Antibodies, Viral; D000956:Antigens, Viral; D000939:Epitopes; D014613:Vaccines, Attenuated