title: Tuberculin skin testing of close contacts: recent or long-standing infection?
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D016358:Contact Tracing; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D011792:Quebec; D012189:Retrospective Studies; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000175:diagnosis / Q000517:prevention & control* / Q000635:transmission