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The use of whole-genome sequencing for molecular epidemiology and antimicrobial surveillance: identifying the role of IncX3 plasmids and the spread of blaNDM-4-like genes in the Enterobacteriaceae
  1. Björn A Espedido1,2,3,
  2. Borce Dimitrijovski1,2,4,
  3. Sebastiaan J van Hal2,4,
  4. Slade O Jensen1,2,3
  1. 1Molecular Medicine Research Group, School of Medicine, University of Western Sydney, Sydney, New South Wales, Australia
  2. 2Antibiotic Resistance & Mobile Elements Group, Ingham Institute for Applied Medical Research, Sydney, New South Wales, Australia
  3. 3South Western Sydney Clinical School, University of New South Wales, Sydney, New South Wales, Australia
  4. 4Department of Microbiology and Infectious Diseases, Royal Prince Alfred Hospital, Sydney, New South Wales, Australia
  1. Correspondence to Ass Prof. Slade O Jensen, Molecular Medicine Research Group, School of Medicine, University of Western Sydney, Penrith, Sydney, NSW 2751, Australia; s.jensen{at}uws.edu.au

Abstract

Aims To characterise the resistome of a multi-drug resistant Klebsiella pneumoniae (Kp0003) isolated from an Australian traveller who was repatriated to a Sydney Metropolitan Hospital from Myanmar with possible prosthetic aortic valve infective endocarditis.

Methods Kp0003 was recovered from a blood culture of the patient and whole genome sequencing was performed. Read mapping and de novo assembly of reads facilitated in silico multi-locus sequence and plasmid replicon typing as well as the characterisation of antibiotic resistance genes and their genetic context. Conjugation experiments were also performed to assess the plasmid (and resistance gene) transferability and the effect on the antibiotic resistance phenotype.

Results Importantly, and of particular concern, the carbapenem-hydrolysing β-lactamase gene blaNDM-4 was identified on a conjugative IncX3 plasmid (pJEG027). In this respect, the blaNDM-4 genetic context is similar (at least to some extent) to what has previously been identified for blaNDM-1 and blaNDM-4-like variants.

Conclusions This study highlights the potential role that IncX3 plasmids have played in the emergence and dissemination of blaNDM-4-like variants worldwide and emphasises the importance of resistance gene surveillance.

  • ANTIBIOTICS
  • MICROBIAL GENETICS
  • MOLECULAR PATHOLOGY

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