Microorganisms (Jul 2024)

Genomic Characterization of a Clinical NDM-1-Producing <i>Klebsiella michiganensis</i> from Brazil

  • Amanda Yaeko Yamada,
  • Andreia Rodrigues de Souza,
  • Amanda Maria de Jesus Bertani,
  • Karoline Rodrigues Campos,
  • Claudio Tavares Sacchi,
  • Denise Brandão de Assis,
  • Enéas de Carvalho,
  • Elizabeth Harummyy Takagi,
  • Marcos Paulo Vieira Cunha,
  • Monique Ribeiro Tiba-Casas,
  • Carlos Henrique Camargo

DOI
https://doi.org/10.3390/microorganisms12071408
Journal volume & issue
Vol. 12, no. 7
p. 1408

Abstract

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Public health faces daily challenges due to increasing reports of pathogenic microorganisms with new antimicrobial resistance. Klebsiella michiganensis, an emerging pathogen, poses difficulty in its identification using conventional techniques. This study presents the first documented case of NDM-1-producing K. michiganensis in Brazil, identified as the new ST418. Initially, the isolate from a tracheal secretion was misidentified as K. oxytoca. However, accurate identification was achieved through ANI analyses. Whole-genome sequencing was conducted to characterize the genetic context of the resistance genes, to identify virulence factors, and to construct a phylogenetic tree. The blaNDM-1 gene was found to be harbored on an IncFIB plasmid approximately 112 kb in length, which was transferable in conjugation assays. The detection of carbapenem resistance genes in this species highlights the importance of public health vigilance, as it may serve as a reservoir and disseminator of significant resistance genes.

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