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Volume 70, Issue 7

Hospital transmission of borderline oxacillin-resistant evaluated by whole-genome sequencing Open Access

Abstract

is a major cause of hospital infections worldwide. Awareness towards methicillin-resistant (MRSA) infections is high but attention towards borderline oxacillin-resistant (BORSA) is limited, possibly due to an underestimated clinical relevance, presumption of low incidence and diagnostic limitations.

BORSA surveillance has not been routinely implemented, and thus consensus with regard to a definition and infection control measures is lacking.

Our goals were to investigate the occurrence, molecular characteristics and clinical manifestations of BORSA infections in the hospital setting.

Following an increased incidence in 2016, BORSA cases in 2014/2016 (in our institution) were more specifically evaluated. Medical records were reviewed to investigate epidemiological links, clinical characteristics and outcomes. Resistance and virulence markers were assessed by whole genome sequencing (WGS). Conventional methods: amplified fragment length polymorphism (AFLP) ; multilocus sequence typing (MLST) and multiple locus variable-number tandem repeat analysis (MLVA) were compared with core genome MLST (cgMLST) and whole-genome single nucleotide polymorphism (wgSNP) analysis to confirm genetic clusters.

From 2009 to 2013, BORSA comprised 0.1 % of all clinical strains. In 2016, the incidence was six-fold higher in comparison to the baseline. Whole-genome SNP and cgMLST confirmed two BORSA clusters among patients with dermatological conditions. Patients with BORSA presented with skin infections, and one case developed a severe invasive infection with a fatal outcome. Infection control measures successfully prevented further transmission in both clusters. WGS findings showed that BORSA strains carried multiple resistance and virulence genes with increased pathogenic potential.

WGS and cgMLST effectively characterized and confirmed BORSA clusters among at-risk patients with clinical manifestations ranging from mild skin infections to life-threatening bacteraemia. Clinical awareness and active monitoring are therefore warranted for the timely implementation of infection control measures to prevent BORSA transmission in high-risk patients.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): antimicrobial resistance , BORSA , cgMLST , infection control , nosocomial transmission and WGS
© 2021 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License.
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2021-07-16
2024-05-06
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Hospital transmission of borderline oxacillin-resistant Staphylococcus aureus evaluated by whole-genome sequencing
J. Med. Microbiol. 70, 001384 (2021); https://doi.org/10.1099/jmm.0.001384
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