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http://dx.doi.org/10.4014/jmb.1401.01023

Characterization of CTX-M-Type Extended-Spectrum Beta-Lactamase-Producing Diarrheagenic Escherichia coli Isolates in the Republic of Korea During 2008-2011  

Kim, Jin Seok (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Kim, Junyoung (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Kim, Soo-Jin (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Jeon, Se-Eun (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Oh, Kyung Hwan (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Cho, Seung-Hak (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Kang, Yeon-Ho (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Han, Soon Young (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Chung, Gyung Tae (Division of Enteric Diseases, Center for Infectious Diseases, Korea National Institute of Health)
Publication Information
Journal of Microbiology and Biotechnology / v.24, no.3, 2014 , pp. 421-426 More about this Journal
Abstract
To characterize the extended-spectrum beta-lactamases (ESBLs) in diarrheagenic Escherichia coli from Korea in 2008-2011, we screened seven enterotoxigenic E. coli (ETEC) and one enteroaggregative E. coli (EAEC) that produce ESBLs from a nationwide survey. All eight isolates produced CTX-M-type ESBLs, including CTX-M-12 (n = 4), CTX-M-14 (n = 2), and CTX-M-15 (n = 2). PCR-based replicon typing indicated that the $bla_{CTX-M-12}$ genes of four ETEC isolates were carried on a conjugative IncF plasmid, whereas the $bla_{CTX-M-14}$ of one EAEC was located on an IncK plasmid. This is the first report of the occurrence of $bla_{CTX-M}$ genes in clinical isolates of EAEC in Korea. The ESBL-producing isolates were shown to be different based on pulsed-field gel electrophoresis and multilocus sequence typing, whereas the four isolates with CTX-M-12 were clonally related. These observations raise an alarm for the spread of plasmid-mediated resistance to ESBL among diarrheagenic E. coli.
Keywords
ESBL; CTX-M; IncF; ETEC; EAEC;
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