title: Letter: Trypsin-treated human erythrocytes for rubella hemagglutination inhibition tests.
mesh_terms: D000017:ABO Blood-Group System; D004912:Erythrocytes / Q000276:immunology*; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D012409:Rubella / Q000175:diagnosis* / Q000276:immunology; D014357:Trypsin
chemical_list: D000017:ABO Blood-Group System; D014357:Trypsin