1887

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Volume 9, Issue 9

Clonal expansion and rapid characterization of ST1788, an otherwise uncommon strain spreading in Wales, UK Open Access

Abstract

A multidrug-resistant strain of () sequence type (ST) 1788, an otherwise uncommon ST worldwide, was isolated from 65 patients at 11 hospitals and 11 general practices across South and West Wales, UK, between February 2019 and November 2021. A collection of 97 ST1788 isolates (including 94 from Wales) was analysed to investigate the diversity and spread across Wales and to identify molecular marker(s) to aid development of a strain-specific real-time PCR. Whole genome sequencing (WGS) was performed with Illumina technology and the data were used to perform phylogenetic analyses. Pan-genome analysis of further genome collections was used to identify an ST1788-specific gene target; a real-time PCR was then validated against a panel of 314 strains and 218 broth-enriched screening samples. Low genomic diversity was demonstrated amongst the 94 isolates from Wales. Evidence of spread within and across healthcare facilities was found. A yersiniabactin locus and the KL2 capsular locus were identified in 85/94 (90.4 %) and 94/94 (100 %) genomes respectively; , , and were simultaneously carried by 86/94 (91.5 %) isolates; 4/94 (4.3 %) isolates also carried carbapenemase. Aminoglycoside and fluoroquinolone resistance markers were found in 94/94 (100 %) and 86/94 (91.5 %) isolates respectively. The ST1788-specific real-time PCR was 100 % sensitive and specific. Our analyses demonstrated recent clonal expansion and spread of ST1788 in the community and across healthcare facilities in South and West Wales with isolates carrying well-defined antimicrobial resistance and virulence markers. An ST1788-specific marker was also identified, enabling rapid and reliable preliminary characterization of isolates by real-time PCR. This study confirms the utility of WGS in investigating novel strains and in aiding proactive implementation of molecular tools to assist infection control specialists.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): ESBL , KL2 , Klebsiella pneumoniae , multidrug resistance , PCR , ST1788 and yersiniabactin
Funding
This study was supported by the:
  • Bill and Melinda Gates Foundation (Award INV-025280)
    • Principle Award Recipient: SophiaDavid
© 2023 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2023-09-05
2024-05-06
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Clonal expansion and rapid characterization of Klebsiella pneumoniae ST1788, an otherwise uncommon strain spreading in Wales, UK
M Gen 9, 001104 (2023); https://doi.org/10.1099/mgen.0.001104
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