title: [Comparative role played by HBsAg-positive and -negative chronic persistent hepatitis patients in intrafamilial transmission of hepatitis type B].
mesh_terms: D006509:Hepatitis B / Q000235:genetics* / Q000635:transmission; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans
chemical_list: D006514:Hepatitis B Surface Antigens