CXCL10 and tuberculosis: Out of the 26 negative QFT-Plus test results (i.e., active TB patients misclassified as non-infected by QFT-Plus; Table 3), 25 had valid T-Track® TB results for both CXCL10 and IFNG markers, and one had no valid T-Track® TB result for CXCL10 and was only rated by IFNG single-marker analysis.