Comparative analysis of an IncR plasmid carrying armA, blaDHA-1 and qnrB4 from Klebsiella pneumoniae ST37 isolates

Qinglan Guo, Caressa Nicole Spychala, Christi Lee McElheny, Yohei Doi

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26 Citations (Scopus)


Objectives: The objective of this study was to conduct a comparative analysis with reported IncR plasmids of a Klebsiella pneumoniae IncR plasmid carrying an MDR region. Methods: MDR K. pneumoniae isolates were serially identified from two inpatients at a hospital in the USA in 2014. MDR plasmid pYDC676 was fully sequenced, annotated and compared with related plasmids. Antimicrobial susceptibility testing, PFGE and MLST were also conducted. Results: The K. pneumoniae isolates were identical by PFGE, belonged to ST37 and harboured an identical ~50 kb IncR plasmid (pYDC676). pYDC676 possessed the backbone and multi-IS loci closely related to IncR plasmids reported from aquatic bacteria, as well as animal and human K. pneumoniae strains, and carried an MDR region consisting of armA, blaDHA-1 and qnrB4, a combination that has been reported in IncR plasmids from K. pneumoniae ST11 strains in Europe and Asia. A plasmid with the identical IncR backbone and a similar MDR region containing blaDHA-1 and qnrB4 has also been reported in ST37 strains from Europe, suggesting potential dissemination of this lineage of IncR plasmids in K. pneumoniae ST37. Conclusions: K. pneumoniae ST37 strains with an MDR IncR plasmid carrying armA, blaDHA-1 and qnrB4 were identified in a hospital in the USA, where these resistance genes remain rare. The IncR backbone may play a role in the global dissemination of these resistance genes.

Original languageEnglish
Article numberdkv444
Pages (from-to)882-886
Number of pages5
JournalJournal of Antimicrobial Chemotherapy
Issue number4
Publication statusPublished - 01-04-2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Microbiology (medical)
  • Infectious Diseases
  • Pharmacology (medical)


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