title: Concomitant hepatitis B surface antigen and antibody.
mesh_terms: D003429:Cross Reactions; D006510:Hepatitis B Antibodies / Q000032:analysis*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D011933:Reagent Kits, Diagnostic
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens; D011933:Reagent Kits, Diagnostic