title: HB antigen: incidence of 'ad' and 'ay' subdeterminants among blood donors.
mesh_terms: D001782:Blood Donors; D002353:Carrier State; D000939:Epitopes; D005838:Genotype; D006509:Hepatitis B / Q000276:immunology; D006511:Hepatitis B Antigens; D006515:Hepatitis B virus / Q000276:immunology; D005779:Immunodiffusion
chemical_list: D000939:Epitopes; D006511:Hepatitis B Antigens