title: Studies on the subtypes of hepatitis B surface antigen-demonstration of vertical and intrafamilial transmission of hepatitis B virus.
mesh_terms: D005260:Female; D006509:Hepatitis B / Q000635:transmission*; D006514:Hepatitis B Surface Antigens / Q000032:analysis*; D006801:Humans; D008297:Male
chemical_list: D006514:Hepatitis B Surface Antigens