As consistent with these results, recent results reported by Uzorka and colleagues indicated that approximately two-thirds of patients with borderline QuantiFERON-TB Gold Plus results tested positive for active TB infection using an independent assay based on CXCL9/CXCL10 biomarkers (21), thus indicating that CXCL9 level correlates with MTB infection status. This evidence concerns the gene CXCL9 and tuberculosis.