The emergence of multidrug resistant (MDR) Mycobacterium tuberculosis (Mtb) strains, resistant to the frontline anti-tubercular drugs rifampicin and isoniazid, forces treatment with less effective and
Footnotes: TB: tuberculosis; HIV: human immunodeficiency virus; n/N = number of positive tests/number of tested sera in each group; TST: tuberculin skin test (cut-off 5 mm); Cut-off value for PGL-Tb1: