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Table 1 Infection status versus age, sex, migration, exposure time, and Mantoux status

From: Use of interferon gamma-based assay to diagnose tuberculosis infection in health care workers after short term exposure

Characteristics New
TST positives
HCWs (n = 27)
Previously defined as TST positive
HCWs (n = 15)
TST negatives HCWs (n = 113) Healthy Controls
(n = 48)
Age (years, mean (range)) 38.9 (22–65) 38.9 (22–65) 38.9 (22–65) 41.4 (20–67)
Sex (female/male) 22/5 12/3 98/15 33/15
Migration     
1. Born in a low-endemic area 25 12 101 48
2. Worked in a high-endemic area > 6 months 0 0 6  
3. Born in a high-endemic area 2 2 6  
Exposure time (≤ 8 h/> 8 h) 20/7 10/4 84/29  
Mantoux (mm) before exposure (median) 8   6/13 5/4
Mantoux (mm) after exposure (median) 19   6/6  
Vesiculous Mantoux after exposure 8    
  1. *Results in absolute numbers from post-exposure screening of 155 health care workers (HCWs) and 48 healthy controls, 2005–2007. During childhood all participants were either BCG-immunized or had a naturally positive tuberculin skin test (TST). The definition of a positive TST (Mantoux) was an increase of ≥ 10 mm, or of ≥ 15 mm if previous TST status was unknown (in concordance with the national guidelines). Some HCWs had been defined as TST positive during previous post-exposure screenings (15), while others were defined as infected during the current study (27).