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Volume 54, Issue 9

Nosocomial spread of multi-resistant containing a plasmid encoding multiple β-lactamases Free

Abstract

Six isolates that exhibited resistance to a wide spectrum of antibiotics were recovered from the intensive care units in the First Affiliated Hospital, Zhejiang University, Hangzhou, China. All isolates contained two plasmids of approximately 95 kb and 200 kb. The 95 kb plasmid was shown to be transferable by conjugation experiments. Isoelectric focusing patterns of the β-lactamases extracted from the six transconjugants were identical, displaying five pI bands: 5.4, 7.75, 8.0, 8.2 and 8.4. The band corresponding to a pI of 7.75 could be inhibited by cloxacillin but not clavulanic acid, while the other bands could be inhibited by clavulanic acid but not cloxacillin. The 95 kb plasmid was digested with dIII and a recombinant plasmid pT948 was obtained. The insert was found to contain , regulatory gene and an insertion element (IS), which was downstream of . PCR and DNA sequencing results confirmed that the 95 kb plasmid encoded at least four β-lactamase genes: , , and . Epidemiological typing by PFGE of the six clinical isolates of demonstrated identical genotypic patterns. In conclusion, all results indicated that the six multi-drug resistant clinical isolates of most probably originated from one clone and caused a localized epidemic in the intensive care units.

  • Received:
  • Accepted:
  • Published Online:
© Microbiology Society
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2005-09-01
2024-04-18
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Nosocomial spread of multi-resistant Klebsiella pneumoniae containing a plasmid encoding multiple β-lactamases
J. Med. Microbiol. 54, 885 (2005); https://doi.org/10.1099/jmm.0.46151-0
/content/journal/jmm/10.1099/jmm.0.46151-0
/content/journal/jmm/10.1099/jmm.0.46151-0
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