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. 2015 Sep 15;8(9):15423-31.
eCollection 2015.

In vitro drug susceptibility of 40 international reference rapidly growing mycobacteria to 20 antimicrobial agents

Hui Pang  1 , Guilian Li  2 , Li Wan  3 , Yi Jiang  4 , Haican Liu  4 , Xiuqin Zhao  4 , Zhongfu Zhao  5 , Kanglin Wan  2
Affiliations

In vitro drug susceptibility of 40 international reference rapidly growing mycobacteria to 20 antimicrobial agents

Hui Pang et al. Int J Clin Exp Med. .

Abstract

Rapidly growing mycobacteria (RGM) are human pathogens that are relatively easily identified by acid-fast staining but are proving difficult to treat in the clinic. In this study, we performed susceptibility testing of 40 international reference RGM species against 20 antimicrobial agents using the cation-adjusted Mueller-Hinton (CAMH) broth microdilution based on the minimum inhibitory concentration (MIC) assay recommended by the guidelines of the Clinical and Laboratory Standards Institute (CLSI). The results demonstrated that RGM organisms were resistant to the majority of first-line antituberculous agents but not to second-line fluoroquinolones or aminoglycosides. Three drugs (amikacin, tigecycline and linezolid) displayed potent antimycobacterial activity against all tested strains. Capreomycin, levofloxacin and moxifloxacin emerged as promising candidates for the treatment of RGM infections, and cefoxitin and meropenem were active against most strains. Mycobacterium chelonae (M. chelonae), M. abscessus, M. bolletii, M. fortuitum, M. boenickei, M. conceptionense, M. pseudoshottsii, M. septicum and M. setense were the most resistant RGM species. These results provide significant insight into the treatment of RGM species and will assist optimization of clinical criteria.

Keywords: Drug susceptibility; antimicrobial; minimum inhibitory concentration (MIC); rapidly growing mycobacteria (RGM); reference strains.

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Figures

Figure 1
Figure 1
Susceptibility of 40 reference rapidly growing mycobacteria to 20 selected antimicrobial agents.
Figure 2
Figure 2
Susceptibility of the Mycobacterium abscessus group to 20 selected antibacterial agents.
Figure 3
Figure 3
Susceptibility of the Mycobacterium fortuitum group to 20 selected antibacterial agents.
Figure 4
Figure 4
Susceptibility of the Mycobacterium smegmatis group to 20 selected antibiotics.
See this image and copyright information in PMC

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