No significant association of baseline TST and QFT-GIT assay response with subsequent development of active TB in present study is consistent with previous systematic review showing poor predictive ability of both these tests.[26] The results suggest that TST and QFT-GIT assay, both being immunological markers of Mtb exposure, measuring cellular immune response to TB antigens have similar performance and may be used interchangeably. Here, TST is linked to tuberculosis.