title: Tuberculin skin testing in a chronically sick aged population.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D002908:Chronic Disease; D005188:False Negative Reactions; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D013902:Radiography, Thoracic; D014374:Tuberculin Test