IFNG and tuberculosis: In previous studies, the predictive performance of serum IFN-γ levels for the diagnosis and treatment monitoring of TB was generally inferior to that of CXCR3 ligands.13–15 These results may be attributed to the specificity of CXCR3 ligands to the Th1 lymphocyte pathway12,20 and their higher concentrations compared with IFN-γ.