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Fold increase in IFN-γ, IL-17, and IL-4 mRNA expression after PPD stimulation and the respective ROC curves with AUCs (CI 95%) calculated with TB and RA groups. TB, n = 25; RA, n = 11; MISC, n = 9; and BCG, n = 8. (A) IFN-γ, (B) IL-17, and (C) IL-4. Dashed lines represent the cutoff for each assay and the horizontal bars represent the medians of the gene expression level for each group.
