title: [Epidemical studies of HB antigen transmission].
mesh_terms: D002648:Child; D002675:Child, Preschool; D005260:Female; D006509:Hepatitis B / Q000635:transmission; D006514:Hepatitis B Surface Antigens; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D006514:Hepatitis B Surface Antigens