title: Two-step PPD testing for nursing home patients.
authors.forename: E
authors.initials: E
authors.lastname: Lefton
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D006801:Humans; D008875:Middle Aged; D009735:Nursing Homes; D014374:Tuberculin Test / Q000379:methods*