Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Antimicrobial Resistance of Seventy Lactic Acid Bacteria Isolated from Commercial Probiotics in Korea

  • Eunju Shin (Culture Collection of Antimicrobial Resistant Microbes, Department of Horticulture, Biotechnology, and Landscape Architecture, Seoul Women's University) ;
  • Jennifer Jaemin Paek (Culture Collection of Antimicrobial Resistant Microbes, Department of Horticulture, Biotechnology, and Landscape Architecture, Seoul Women's University) ;
  • Yeonhee Lee (Culture Collection of Antimicrobial Resistant Microbes, Department of Horticulture, Biotechnology, and Landscape Architecture, Seoul Women's University)
  • Received : 2022.10.25
  • Accepted : 2023.01.03
  • Published : 2023.04.28
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Abstract

In this study, lactic acid bacteria were isolated from 21 top-selling probiotic products on Korean market and their antimicrobial resistance were analyzed. A total 152 strains were claimed to be contained in these products and 70 isolates belonging to three genera (Bifidobacterium, Lactobacillus, and Lactococcus) were obtained from these products. RAPD-PCR showed diversity among isolates of the same species except for two isolates of Lacticaibacillus rhamnosus from two different products. The agar dilution method and the broth dilution method produced different MICs for several antimicrobials. With the agar dilution method, five isolates (three isolates of Bifidobacterium animalis subsp. lactis, one isolate of B. breve, one isolate of B. longum) were susceptible to all nine antimicrobials and 15 isolates were multi-drug resistant. With the broth microdilution method, only two isolates (one isolate of B. breve and one isolate of B. longum) were susceptible while 16 isolates were multi-drug resistant. In this study, only two AMR genes were detected: 1) lnu(A) in one isolate of clindamycin-susceptible and lincomycin-resistant Limosilactobacillus reuteri; and 2) tet(W) in one tetracycline-susceptible isolate of B. longum B1-1 and two tetracycline-susceptible isolates and three tetracycline resistant isolates of B. animalis subsp. lactis. Transfer of these two genes via conjugation with a filter mating technique was not observed. These results suggest a need to monitor antimicrobial resistance in newly registered probiotics as well as probiotics with a long history of use.

Keywords

Acknowledgement

This work was supported by a grant (NRF-2018R1D1A1B07047284) of the National Research Foundation (NRF) funded by the Ministry of Science and ICT (MSIT), Republic of Korea.

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