title: Hepatitis B antigen: regional variation in incidence and subtype ratio in the American Red Cross donor population.
mesh_terms: D001782:Blood Donors; D004586:Electrophoresis; D005843:Geography; D006385:Hemagglutination Inhibition Tests; D006511:Hepatitis B Antigens / Q000032:analysis*; D006801:Humans; D005779:Immunodiffusion; D011863:Radioimmunoassay; D012011:Red Cross; D012703:Serotyping; D013223:Statistics as Topic; D014481:United States
chemical_list: D006511:Hepatitis B Antigens