CDC recommends 2-step TB skin testing for hospital employees: new scheme copes with "false positive" conversions.
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D004651:Employment; D005260:Female; D006801:Humans; D006968:Hypersensitivity, Delayed; D008297:Male; D009784:Occupational Diseases / Q000517:prevention & control; D009786:Occupational Health Services / Q000458:organization & administration; D010564:Personnel, Hospital; D012882:Skin Tests / Q000379:methods*; D014397:Tuberculosis, Pulmonary / Q000175:diagnosis / Q000517:prevention & control*; D014481:United States