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• W2283318700 abstract "ABSTRACT In order to correlate the mutations inside the entire gyrA and gyrB genes with the level of resistance to ofloxacin (OFX) and moxifloxacin (MFX) in isolates of multidrug-resistant Mycobacterium tuberculosis (MDR-TB), a total of 111 isolates were categorized into OFX-susceptible (MIC, ≤2 μg/ml) and low-level (MIC, 4 to 8 μg/ml) and high-level (MIC, ≥16 μg/ml) OFX-resistant isolates and MFX-susceptible (MIC, ≤0.5 μg/ml) and low-level (MIC, 1 to 2 μg/ml) and high-level (MIC, ≥4 μg/ml) MFX-resistant isolates. Resistance-associated mutations inside the gyrA gene were found in 30.2% of OFX-susceptible and 72.5% and 72.2% of low-level and high-level OFX-resistant isolates and in 28.6% of MFX-susceptible and 58.1% and 83.9% of low-level and high-level MFX-resistant isolates. Compared with OFX-susceptible isolates, low-level and high-level OFX-resistant isolates had a significantly higher prevalence of mutations at gyrA codons 88 to 94 (17.0%, 65.0%, and 72.2%, respectively; P < 0.001) and a higher prevalence of the gyrB G512R mutation (0.0%, 2.5%, and 16.7%, respectively; P = 0.006). Similarly, compared with MFX-susceptible isolates, low-level and high-level MFX-resistant isolates had a significantly higher prevalence of mutations at gyrA codons 88 to 94 (14.3%, 51.6%, and 80.6%, respectively; P < 0.001) as well as a higher prevalence of the gyrB G512R mutation (0.0%, 0.0%, and 12.9%, respectively; P = 0.011). D94G and D94N mutations in gyrA and the G512R mutation in gyrB were correlated with high-level MFX resistance, while the D94A mutation was associated with low-level MFX resistance. The prevalence of mutations at gyrA codons 88 to 94 and the gyrB G512R mutation were higher among fluoroquinolone (FQ)-susceptible East Asian (Beijing) and Indo-Oceanic strains than they were among Euro-American strains, implying that molecular techniques to detect FQ resistance may be less specific in areas with a high prevalence of East Asian (Beijing) and Indo-Oceanic strains." @default.
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• W2283318700 date "2016-04-01" @default.
• W2283318700 modified "2023-10-16" @default.
• W2283318700 title "Mutations in <i>gyrA</i> and <i>gyrB</i> among Fluoroquinolone- and Multidrug-Resistant Mycobacterium tuberculosis Isolates" @default.
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• W2283318700 doi "https://doi.org/10.1128/aac.01049-15" @default.
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