title: Hepatitis-B surface antigen among residents of an institution for the mentally retarded.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000276:immunology*; D005260:Female; D006511:Hepatitis B Antigens; D006778:Hospitals, Psychiatric; D006801:Humans; D008607:Intellectual Disability / Q000276:immunology*; D008297:Male; D008875:Middle Aged
chemical_list: D006511:Hepatitis B Antigens