Abstract

The Xpert MTB/XDR assay (Mycobacterium tuberculosis/extensively drug resistant; Cepheid, Sunnyvale, CA, USA) is a recent addition to the repertoire of tuberculosis (TB) drug susceptibility testing (DST) technologies and is set to bolster the early detection of drug-resistant TB [1]. Following on from the Xpert MTB/RIF (rifampin) Ultra assay, already used extensively to detect the presence of Mycobacterium tuberculosis complex and resistance to rifampicin, the Xpert MTB/XDR assay is designed to detect resistance to isoniazid, fluoroquinolones, ethionamide, and second-line injectables [1].

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