摘要：Multi-drug resistant tuberculosis (MDRTB) is defined as a strain of Mycobacterium tuberculosis with resistance to at least isoniazid (H) and rifampicin (R), the two key drugs in TB treatment. Very recently, extensively drug-resistant tuberculosis (XDRTB) has gained notoriety and is defined as MDRTB with additional resistance to any fluoroquinolone, and to at least one of three injectable second-line anti-TB drugs (capreomycin, kanamycin, and amikacin) used in MDRTB treatment
