Figure 1From: Use of interferon gamma-based assay to diagnose tuberculosis infection in health care workers after short term exposure Distribution of Mantoux test results by mm induration among 155 exposed health care workers and 48 healthy controls. Left columns: percent of total number of exposed health care workers (HCWs). Right columns: percent of total number of healthy controls. HCWs with a previous positive TST (by Mantoux test ≥ 10 mm increase or ≥ 15 mm if previously unknown) where not retested, but were counted as ≥ 15 mm. The distribution of T-SPOT.TB positives is indicated by white circles; all of these 5 HCWs had ≥ 15 mm induration or were vesicular.Back to article page