title: Family contacts of HAA-positive persons.
mesh_terms: D000293:Adolescent; D006509:Hepatitis B / Q000235:genetics; D006510:Hepatitis B Antibodies / Q000032:analysis; D006511:Hepatitis B Antigens; D006801:Humans
chemical_list: D006510:Hepatitis B Antibodies; D006511:Hepatitis B Antigens