Figure 2From: In-hospital contact investigation among health care workers after exposure to smear-negative tuberculosis Frequencies of positive test results. Frequencies of recent positive test results (%) are displayed depending on: A) overall positivity; B) categorized age; C) birth in a foreign country; D) Bacillus Calmette-Guérin (BCG) vaccination. Prior TST results are plotted for comparison (dark blue column).Back to article page