Enterococcus faecalis FK-23, isolated from human intestinal tract, was used widely as probiotics. However, vancomycin-resistant Enterococci (VRE) containing vancomycin-resistant
E. faecalis also exist, and appearing of VRE has serious problems in the world. In this study, we investigated antimicrobial susceptibility of
E. faecalis FK-23 and vancomycin resistance genes prevalence in the organisms.
E. faecalis FK-23 was susceptible to various antibiotics such as benzylpenicillin, aminobenzylpenicillin, gentamicin, erythromycin, minocyclin, levofloxacin and vancomycin, and showed intermediate resistance to cefazolin and ciprofloxacin by Kirby-Bauer disk method. Minimal inhibitory concentration (MIC) of vancomycin to
E. faecalis FK-23 showed 2 μg/m
l by using agar dilution method. Vancomycin resistance genes, such as
vanA,
vanB,
vanC-1,
vanC-2, and
vanC-3 were not detected in
E. faecalis FK-23 by using PCR method. These results suggest that
E. faecalis FK-23 is safety for using probiotics.
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