Low prevalence of the booster phenomenon in nursing-home employees in Maryland.
D000293:Adolescent; D000328:Adult; D006801:Humans; D008396:Maryland; D008875:Middle Aged; D009735:Nursing Homes; D009784:Occupational Diseases / Q000517:prevention & control*; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000517:prevention & control*