title: Hepatitis B infection in an orphanage.
mesh_terms: D000293:Adolescent; D002648:Child; D002674:Child, Institutionalized; D002675:Child, Preschool; D006509:Hepatitis B / Q000453:epidemiology* / Q000276:immunology / Q000635:transmission; D006510:Hepatitis B Antibodies / Q000032:analysis; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006801:Humans; D008297:Male
chemical_list: D006510:Hepatitis B Antibodies; D006514:Hepatitis B Surface Antigens