The emergence of hypervirulent blaNDM-1-positive Klebsiella pneumoniae sequence type 395 in an oncology hospital

Infect Genet Evol. 2020 Nov:85:104527. doi: 10.1016/j.meegid.2020.104527. Epub 2020 Sep 6.

Abstract

Fifteen hypermucoviscous isolates (13 blaNDM-1-positive) obtained from 11 oncology patients were analyzed by whole genome sequencing, and selected isolates were assessed in a murine model of sepsis. ST395/K2 isolates harboring rmpA, rmpA2, peg-344, aerobactin, enterobactin, yersiniabactin, type I fimbriae, etc. displayed maximal virulence in the mouse lethality assay (LD50 = 102 CFU). ST147/K20 isolates lacking yersiniabactins were relatively less virulent (LD50 = 104 CFU), ST395/K2 isolates lacking rmpA, rmpA2, peg-344, and aerobactin, but harboring yersiniabactin demonstrated minimal virulence (LD50 = 105 CFU). Isolates represent various paths and stages of evolution directed towards convergence of multidrugresistant classical Klebsiella pneumoniae and hypervirulent K. pneumoniae.

Keywords: Antimicrobial resistance; Hypermucoviscous Klebsiella pneumoniae; New Delhi metallo-beta-lactamase 1; Virulence.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Anti-Bacterial Agents / therapeutic use*
  • Drug Resistance, Bacterial / genetics*
  • Humans
  • Klebsiella Infections / drug therapy*
  • Klebsiella pneumoniae / drug effects
  • Klebsiella pneumoniae / genetics*
  • Klebsiella pneumoniae / pathogenicity*
  • Mice
  • Microbial Sensitivity Tests
  • Models, Animal
  • Multilocus Sequence Typing
  • Sepsis / genetics
  • Sepsis / microbiology
  • Virulence / genetics*
  • Whole Genome Sequencing
  • beta-Lactamases / genetics*

Substances

  • Anti-Bacterial Agents
  • beta-Lactamases
  • beta-lactamase NDM-1