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Quantitative IFN-γ responses to QFT-Plus antigen TB1 (A), TB2 (B), and QFT-GIT antigen (C). Horizontal lines in red indicate median production and dotted lines indicate cut-off (Log10 0.35=−0.456). *, P<0.05; ***, P<0.001. IFN, interferon; IU, international unit; LTBI, latent tuberculosis infection; HC, healthy control; QFT-GIT, QuantiFERON-TB Gold In-Tube; NS, not significant.
