title: Australia antigen in Singapore. 1. Frequency in blood donors.
mesh_terms: D044466:Asian People; D001769:Blood / Q000382:microbiology; D001782:Blood Donors; D001789:Blood Group Antigens; D002681:China; D006506:Hepatitis A / Q000453:epidemiology / Q000382:microbiology; D006515:Hepatitis B virus / Q000302:isolation & purification*; D006801:Humans; D007122:Immunoelectrophoresis; D012846:Singapore
chemical_list: D001789:Blood Group Antigens