title: Studies on the precipitin content of bovine sera prepared against various biotypes of Brucella abortus.
mesh_terms: D000818:Animals; D000941:Antigens / Q000032:analysis*; D002003:Brucella abortus / Q000276:immunology*; D002417:Cattle; D007106:Immune Sera / Q000032:analysis*; D005779:Immunodiffusion; D011234:Precipitins / Q000032:analysis*
chemical_list: D000941:Antigens; D007106:Immune Sera; D011234:Precipitins