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Clinical and molecular epidemiology of extended-spectrum β-lactamase-producing Escherichia coli and Klebsiella pneumoniae in a long-term study from Japan

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Abstract

The detection rates of extended-spectrum β-lactamase (ESBL)-producing bacteria in Japan are very low (∼5%) compared with those obtained worldwide. Further, the current trend of these bacteria in Japan is not known, and few studies with longitudinal observations have been reported. To obtain epidemiologic data on ESBL-producing bacteria, their genotypic features, and their antibiotic resistance patterns in Japan, we analyzed bacterial isolates from hospitalized patients at our institution over the 7-year period from 2003 to 2009. Of 2,304 isolates, 202 (8.8%) were found to be ESBL producers, including Escherichia coli, Klebsiella pneumonia, and Proteus mirabilis. The detection rates of the ESBL-producing isolates gradually increased and reached 17.1% and 10.5% for the E. coli and K. pneumoniae strains, respectively, in 2009. Genotyping analysis showed that ∼90% of the ESBL-producing isolates carried the CTX-M genotype, in which the CTX-M-9 group was predominant, although the CTX-M-2 group is considered to be the main genotype in Japan; further, many of the strains produced multiple β-lactamases. The detection rates of ESBL-producing bacteria may tend to be high within a limited region in Japan. A countrywide survey is required to understand the trend for ESBL-producing bacteria at the national level. In addition, our findings suggest that the genotypes of the detected ESBL producers are similar to those exhibiting a successful nosocomial spread worldwide.

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Acknowledgments

The authors thank Dr. T. Muratani for the technical support and also thank the Hibiki Research Group for Clinical Microbiology.

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Authors and Affiliations

  1. Department of Blood and Marrow Transplantation, Hara-Sanshin Hospital, 1-8, Taihaku-cho Hakata-ku, Fukuoka, 812-0033, Japan

    Y. Chong, Y. Ito & T. Kamimura

  2. Department of Clinical Laboratory, Hara-Sanshin Hospital, Fukuoka, Japan

    H. Yakushiji

  3. Department of Infection Control, Hara-Sanshin Hospital, Fukuoka, Japan

    Y. Chong & H. Yakushiji

Authors
  1. Y. Chong
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  2. H. Yakushiji
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  3. Y. Ito
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  4. T. Kamimura
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Correspondence to Y. Chong.

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Chong, Y., Yakushiji, H., Ito, Y. et al. Clinical and molecular epidemiology of extended-spectrum β-lactamase-producing Escherichia coli and Klebsiella pneumoniae in a long-term study from Japan. Eur J Clin Microbiol Infect Dis 30, 83–87 (2011). https://doi.org/10.1007/s10096-010-1057-1

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  • DOI: https://doi.org/10.1007/s10096-010-1057-1

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