Emergence of Escherichia coli isolates producing conjugative plasmid-mediated DHA-1 β-lactamase in a Korean university hospital

W. Song, J. S. Kim, H. S. Kim, Seokhoon Jeong, DongEun Yong, K. M. Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Seven isolates of cefoxitin-resistant Escherichia coli with an inducible phenotype were detected between November 2002 and July 2003 in a Korean hospital. Conjugations were tested by the filter mating method using azide-resistant E. coli J53 as the recipient. All isolates and their transconjugants were tested for broth microdilution minimum inhibitory concentrations, isoelectric focusing (IEF), polymerase chain reaction (PCR) for SHV, TEM, CTX-M and DHA-derived β-lactamases, and DNA sequencing. XbaI-digested genomic DNA bands of the seven isolates were separated by pulsed-field gel electrophoresis (PFGE). IEF, PCR and sequence analysis revealed that all isolates possessed a blaTEM-1-like and a blaDHA-1 gene. Two isolates also carried the blaCTX-M-14 gene. Transfer of the resistance by conjugation experiments of all seven isolates was successful, suggesting that the blaDHA-1-containing plasmids in the E. coli isolates were self-transmissible. The isolates were recovered from patients in wards or an intensive care unit, all of which had been exposed to β-lactams before isolation of the DHA-1 producers. Five patterns among the seven isolates were demonstrated by PFGE; sporadic infections with E. coli possessing an inducible β-lactam resistance phenotype were found. DHA-1 encoded by conjugative plasmids conferred the resistance phenotype. The spread of the DHA-1 producers was due to both clonal spread and horizontal transfer of the resistance gene.

Original languageEnglish
Pages (from-to)459-464
Number of pages6
JournalJournal of Hospital Infection
Volume63
Issue number4
DOIs
Publication statusPublished - 2006 Aug 1

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Lactams
Plasmids
Pulsed Field Gel Electrophoresis
Isoelectric Focusing
Escherichia coli
Phenotype
Cefoxitin
Escherichia coli Infections
Horizontal Gene Transfer
Polymerase Chain Reaction
Azides
Microbial Sensitivity Tests
DNA Sequence Analysis
Genes
Sequence Analysis
Intensive Care Units
DNA

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)
  • Infectious Diseases

Cite this

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title = "Emergence of Escherichia coli isolates producing conjugative plasmid-mediated DHA-1 β-lactamase in a Korean university hospital",
abstract = "Seven isolates of cefoxitin-resistant Escherichia coli with an inducible phenotype were detected between November 2002 and July 2003 in a Korean hospital. Conjugations were tested by the filter mating method using azide-resistant E. coli J53 as the recipient. All isolates and their transconjugants were tested for broth microdilution minimum inhibitory concentrations, isoelectric focusing (IEF), polymerase chain reaction (PCR) for SHV, TEM, CTX-M and DHA-derived β-lactamases, and DNA sequencing. XbaI-digested genomic DNA bands of the seven isolates were separated by pulsed-field gel electrophoresis (PFGE). IEF, PCR and sequence analysis revealed that all isolates possessed a blaTEM-1-like and a blaDHA-1 gene. Two isolates also carried the blaCTX-M-14 gene. Transfer of the resistance by conjugation experiments of all seven isolates was successful, suggesting that the blaDHA-1-containing plasmids in the E. coli isolates were self-transmissible. The isolates were recovered from patients in wards or an intensive care unit, all of which had been exposed to β-lactams before isolation of the DHA-1 producers. Five patterns among the seven isolates were demonstrated by PFGE; sporadic infections with E. coli possessing an inducible β-lactam resistance phenotype were found. DHA-1 encoded by conjugative plasmids conferred the resistance phenotype. The spread of the DHA-1 producers was due to both clonal spread and horizontal transfer of the resistance gene.",
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Emergence of Escherichia coli isolates producing conjugative plasmid-mediated DHA-1 β-lactamase in a Korean university hospital. / Song, W.; Kim, J. S.; Kim, H. S.; Jeong, Seokhoon; Yong, DongEun; Lee, K. M.

In: Journal of Hospital Infection, Vol. 63, No. 4, 01.08.2006, p. 459-464.

Research output: Contribution to journalArticle

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