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. 2018 Aug 28;68(10):1705–1712. doi: 10.1093/cid/ciy751

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Figure 2. — TST (mm) and outcomes after retracing PTST− and TST+ TB contacts. A, Boxplots illustrating 1st quartile, median, and 3rd quartile of TST in mm for definite RSTR, reverters, converters, and LTBI. B, Outcomes after retracing PTST− TB contacts. Definite RSTR: 5 of 5 tests (3 QFT, initial and retracing TST) negative. Definite converter: 3 of 3 QFT and follow-up TST were positive. TST/QFT discordant: 3 of 3 QFT positive but initial and retracing TST were negative. C, Outcomes after retracing of TST+ TB contacts. Definite LTBI: 5 of 5 tests (3 QFT, initial and retracing TST) positive. Definite reverter: 3 of 3 QFT and follow-up TST were negative. TST/QFT discordant: 3 of 3 QFT negative but initial and retracing TST were positive. Abbreviations: LTBI, latent M.tb infection; QFT, quantiferon-TB Gold; RSTR, resister phenotype; TB, tuberculosis; TST, tuberculin skin test.