MKI67 and multidrug-resistant tuberculosis: The significant positive association of ED Ki67+HLA-DR− Treg cells with Mtb (r = 0.4212, p = 0.0360) and PPD (r = 0.5116, p = 0.0211, Figure 2C) in patients who were SC positive shows that SAA levels in sub-optimally treated MDR-TB patients is associated with the elevated Treg cell population at baseline.