title: Letter: HBAg carrier state and hypogrammaglobulinaemia.
mesh_terms: D000361:Agammaglobulinemia / Q000276:immunology*; D001782:Blood Donors; D002353:Carrier State; D006509:Hepatitis B / Q000276:immunology*; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D006942:Hypergammaglobulinemia / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010956:Plasmapheresis
chemical_list: D006511:Hepatitis B Antigens