title: Historical risks of tuberculin skin test conversion among non-physician staff at a large urban hospital.
abstract: BACKGROUND
  Nosocomial transmission of Mycobacterium tuberculosis among workers at a 1000-bed inner-city hospital led to an extensive evaluation of this risk among workers with potential exposure to TB patients or laboratory specimens.
  
  
  METHODS
  Retrospective cohort study to determine the incidence and risk of tuberculin skin test (TST) conversions among workers employed 1/1/90 to 9/30/92.
  
  
  RESULTS
  Personal, community, and occupational risk factors were evaluated in 2,362 workers with potential M. tuberculosis exposure and 886 workers with no known exposure. The 33-month cumulative rate of TST conversion was 5.8% for potentially exposed workers and 2.0% for controls (RR 3.6; 95% CI; 2.2-5.8). Among workers with potential M. tuberculosis exposure, statistically significantly elevated risks were found for nurses, laboratory technicians, pharmacy workers, phlebotomists, housekeepers, clerks, emergency room workers, and emergency responders.
  
  
  CONCLUSIONS
  Workers with patient contact and those employed in certain occupational groups were at increased risk for occupational M. tuberculosis infection.
authors.affiliation: Division of Surveillance, Hazard Evaluations and Field Studies, National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, Cincinnati, Ohio, USA. amiller@hrsa.gov
authors.forename: Aubrey K
authors.initials: AK
authors.lastname: Miller
authors.forename: Allison
authors.initials: A
authors.lastname: Tepper
authors.forename: Karl
authors.initials: K
authors.lastname: Sieber
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D015331:Cohort Studies; D016001:Confidence Intervals; D003428:Cross Infection / Q000453:epidemiology / Q000382:microbiology; D005260:Female; D006786:Hospitals, Urban; D006801:Humans; D015994:Incidence; D017758:Infectious Disease Transmission, Patient-to-Professional; D008297:Male; D008875:Middle Aged; D009169:Mycobacterium tuberculosis / Q000302:isolation & purification*; D016272:Occupational Health; D010564:Personnel, Hospital / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D012307:Risk Factors; D017678:Sex Distribution; D014374:Tuberculin Test; D014376:Tuberculosis / Q000175:diagnosis / Q000453:epidemiology / Q000635:transmission*; D014481:United States / Q000453:epidemiology