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Interferon gamma (IFN-γ) responses to stimulation with QuantiFERON-TB Gold In-Tube (QFT-GIT) antigen (Ag) (A), QuantiFERON-TB Gold Plus (QFT-Plus) antigens in TB1 (B) and TB2 (C), maximal levels of TB1/TB2 (D), and differences between TB1 and TB2 (TB2 minus TB1) (E) among definite, possible, and not latent tuberculosis infection (LTBI) groups. A P value of <0.016 was considered significant after Bonferroni correction.
