Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Genetic Diversity and Antibiotic Resistance of Enterococcus faecalis Isolates from Traditional Korean Fermented Soybean Foods

  • Lee, Jong-Hoon (Department of Food Science and Biotechnology, Kyonggi University) ;
  • Shin, Donghun (Department of Food Science and Biotechnology, Kyonggi University) ;
  • Lee, Bitnara (Department of Food Science and Biotechnology, Kyonggi University) ;
  • Lee, Hyundong (Department of Food Science and Biotechnology, Kyonggi University) ;
  • Lee, Inhyung (Department of Bio and Fermentation Convergence Technology, Kookmin University) ;
  • Jeong, Do-Won (Department of Food and Nutrition, Dongduk Women's University)
  • Received : 2016.12.20
  • Accepted : 2017.02.24
  • Published : 2017.05.28
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Abstract

Eighty-five Enterococcus faecalis isolates collected from animals (40 isolates), meju (a Korean fermented soybean product; 27 isolates), humans (10 isolates), and various environmental samples (8 isolates) were subjected to multilocus sequence typing (MLST) to identify genetic differences between samples of different origins. MLST analysis resulted in 44 sequence types (STs), and the eBURST algorithm clustered the STs into 21 clonal complexes (CCs) and 17 singletons. The predominant STs, ST695 (21.1%, 18/85) and ST694 (9.4%, 8/85), were singletons, and only contained isolates originating from meju. None of the STs in the current study belonged to CC2 or CC9, which comprise clinical isolates with high levels of antibiotic resistance. The E. faecalis isolates showed the highest rates of resistance to tetracycline (32.9%), followed by erythromycin (9.4%) and vancomycin (2.4%). All isolates from meju were sensitive to these three antibiotics. Hence, MLST uncovered genetic diversity within E. faecalis, and clustering of the STs using eBURST revealed a correlation between the genotypes and origins of the isolates.

Keywords

References

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