title: Letter: HBsAg hazard in blood and bone-marrow smears.
mesh_terms: D001853:Bone Marrow / Q000276:immunology*; D002648:Child; D006509:Hepatitis B / Q000097:blood* / Q000276:immunology / Q000635:transmission; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D007757:Laboratory Infection / Q000209:etiology*; D007945:Leukemia, Lymphoid / Q000097:blood
chemical_list: D006511:Hepatitis B Antigens