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ecisions in patients aged ≥ 70 years should be made with utmost care. Drug-resistance surveillance (DRS) data provide key information for building an effective treatment regimen in patients with multidrug-resistant tuberculosis (MDR-T. This study was conducted to investigate the patterns and trends of additional drug resistance in MDR-TB patients in South Korea. Phenotypic drug susceptibility test (DST) results of MDR-TB patients collected from seven hospitals in South Korea from 2010 to 2019 were retrospectively analyzed. In total, 63