In an adult study, Chen et al. proposed five serum proteins—I-309 (CCL1; chemokine (C-C motif) ligand 1), MIG (CXCL9; chemokine (C-X-C motif) ligand 9), eotaxin-2, IL-8, and ICAM-1 (intercellular adhesion molecule 1) as biomarkers for active TB screening [49]. This evidence concerns the gene CXCL9 and tuberculosis.