Abstract
We evaluated the performance of two multiplex, real-time PCR tests (Anyplex II MTB/MDR and MTB/XDR; Seegene, Seoul, Korea), designed to detect the Mycobacterium tuberculosis complex (MTC) and drug-resistance mutations associated with isoniazid, rifampicin, fluoroquinolones, and second-line injectable drugs. We analyzed 122 clinical isolates with the Anyplex II MTB/MDR test, 68 of which were also tested with the Anyplex II MTB/XDR test. The Anyplex II MTB/MDR and MTB/XDR tests showed the following respective sensitivities and specificities: 68.8% and 100% for detecting isoniazid resistance, 93.8% and 100% for rifampicin, 82.8% and 100% for levofloxacin, 75.0% and 100% for kanamycin, and 92.6% and 100% for MTC identification. These kits correctly identified 61.8% of multi-drug resistant M. tuberculosis isolates and 64.7% of extensively drug-resistant M. tuberculosis isolates, and enabled semi-automatic detection of drug-resistant MTC in 3 hours. The Anyplex II kits could be useful as rule-in tests for detecting MTC and drug resistance.
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