Drug-Resistant Mycobacterium tuberculosis Isolates from New and Previously Treated TB Patients in China, 2017-2019

摘要

Introduction: Mycobacterium tuberculosis (MTB) is a causative agent of tuberculosis (TB) that causes death worldwide. Methods: MTB was subjected to phenotypic drug-susceptibility tests (DST), and drug-resistant genes were sequenced. Results: Previously treated patients were more likely to have positive smear results and exhibit drug resistance. New patients were more likely to be mono SMresistant and less likely to be INH- and RIF-resistant. The most common mutations were katG (S315T), rpoB (S450L), rpsL (K43R), and embB (M306V). Conclusions: The proportion of mono-SM-resistant TB among new patients was higher.