FIG 1.
Schematic drawing of the origin, release, and potential diagnostic use of M. tuberculosis cfDNA within the human host. M. tuberculosis within the lungs or in extrapulmonary sites release cell-free DNA into the blood circulation, which then may be redistributed in some other biological fluids that can serve as a sample for in vitro diagnostic (IVD) tests (2, 9, 56–62).