Objective: To test the in vitro antibacterial activity of nemonoxacin against clinically isolates of Mycobacterium tuberculosis complex(MTBC), Mycobacterium intracellulare(MI) and Mycobacterium abscessus(MA). Methods: Totally 128, 80 and 50 isolates of MTBC, M.intracellulare and M.abscessus were tested, respectively. The minimum inhibitory concentrations (MICs) of nemonoxacin and levofloxacin against the strains of the three most frequently isolated mycobacterium species were measured by double dilution method with micro-well plate. Results: The MICs of 104(81.2%) strains of MTBC isolates against levofloxacin were ≤ 1 μg/ml. Whereas 112 (87.5%) strains of MTBC isolates had MICs against nemonoxacin than>1 μg/ml, furthermore, the MICs of 88(68.8%)strains of MTBC isolates against nemonoxacin were≥4 μg/ml. The median MIC of M. intracellulare isolates against levofloxacin and nenofloxacin were 16 and 32 μg/ml, separately, while were 16 μg/ml and 8 μg/ml for M. abscessus, respectively. The ratios of nemonoxacin MIC/levofloxacin MIC of M. abscessus were between 0.125-1.000. Conclusions: Nemonoxacin presented weaker inhibitory activity than levofloxacin against M. tuberculosis, whereas it had better activity than levofloxacin against M. abscessus.
目的： 了解奈诺沙星对MTB、胞内分枝杆菌和脓肿分枝杆菌临床分离株的体外抗菌活性。 方法： 分别纳入MTB、胞内分枝杆菌和脓肿分枝杆菌临床分离株128、80和50株。以微孔板倍比稀释法测定左氧氟沙星和奈诺沙星对3种临床常见的分枝杆菌菌种临床分离株的最低抑菌浓度（MIC）。 结果： 128株MTB中104株（81.2%）对左氧氟沙星的MIC≤1 μg/ml，112株（87.5%）对奈诺沙星的MIC>1 μg/ml，其中88株（68.8%）对奈诺沙星的MIC≥4 μg/ml。胞内分枝杆菌对左氧氟沙星和奈诺沙星的MIC的中位数分别为16和32 μg/ml，而脓肿分枝杆菌对左氧氟沙星和奈诺沙星的MIC的中位数分别为16和8 μg/ml。脓肿分枝杆菌临床分离株对奈诺沙星和左氧氟沙星的MIC比值范围在0.126~1.000。 结论： 奈诺沙星对MTB的抗菌活性明显弱于左氧氟沙星，但对脓肿分枝杆菌的抗菌活性优于左氧氟沙星。.
Keywords: Minimum inhibitory concentration; Mycobacterium; Nemonoxacin; Tuberculosis.