Figure 2: Cytokine secretion in M.tb-stimulated whole blood.

The concentration of soluble IFN-γ (white), IL-22 (black) and IL-17A (gray) was measured by ELISA (pg/ml) in plasma from whole blood stimulated with M.tb lysate in individuals with LTBI (n=9). Plasma was harvested at 12 and 24 hours after stimulation. Horizontal bars represent the median. Statistical comparisons were performed using a Wilcoxon test. *p≤0.05, **p≤0.01.