IL6 and tuberculosis: PDL1 expression positively correlated with plasma levels of TNFα (r = 0.6280, p = 0.0003), IL6 (r = 0.6022, p = 0.0007), IP10 (r = 0.5610, p = 0.0019), IFNγ (r = 0.5448, p = 0.0040) and IL10 (r = 0.5299, p = 0.0045) in participants with TB.