Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Epidemiological Typing and Characterization of dfr Genes of Shigella sonnei Isolates in Korea During the Last Two Decades

  • Kim, Ki-Sung (Department of Microbiology, College of Medicine, Seonam University) ;
  • Oh, Jae-Young (Department of Microbiology, College of Medicine, Seonam University) ;
  • Jeong, Yong-Wook (Department of Microbiology, College of Medicine, Seonam University) ;
  • Cho, Jae-We (Department of Microbiology, College of Medicine, Seonam University) ;
  • Park, Jong-Chun (Department of Microbiology, College of Medicine, Seonam University) ;
  • Cho, Dong-Teak (Department of Microbiology, School of Medicine, Kyungpook National University)
  • Published : 2002.02.01
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Abstract

One-hundred and twenty-four trimethoprim-resistant Shigella sonnei isolates extracted in Korea during the last two decades were investigated for their epidemiological relationship and mechanisms of resistance to trimethoprim. The S. sonnei isolates were distributed into two groups by three different epidemiological tools: biotyping, antibiogram, and pulsed-field gel electrophoresis. One group contained the isolates from the 1980s and the other group included the isolates from the 1990s. The geometric mean MICs of trimethoprim in S. sonnei isolates from the 1980s and 1990s were found to be $672.9{\mu}g/ml\;and\;>2,048{\mu}g/ml$, respectively. Trimethoprim resistance was associated with dfrA5, dfrA12, and dfrA13 genes in the isolates from the 1980s, dfrA1, dfrA5, and dfrA12 in the isolates from 1991, and dfrA1 and dfrA12 in the isolates from 1992 to 1999. The dfrA1 gene was located downstream of the intI2 gene in Tn7, which was located on chromosome. Some dfrA12 genes were found as gene cassettes in the class 1 integron. The dfrA5 and dfrA13 genes were located on conjugative plasmids. These results suggested that a clonal change occurred in S. sonnei isolates in Korea during the last two decades and that dfr genes located on different transposable genetic elements had gradually changed.

Keywords

References

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