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Volume 10, Issue 8

Molecular characterization of (StrepA) non-invasive isolates during the 2022–2023 UK upsurge Open Access

Abstract

At the end of 2022 into early 2023, the UK Health Security Agency reported unusually high levels of scarlet fever and invasive disease caused by (StrepA or group A ). During this time, we collected and genome-sequenced 341 non-invasive throat and skin isolates identified during routine clinical diagnostic testing in Sheffield, a large UK city. We compared the data with that obtained from a similar collection of 165 isolates from 2016 to 2017. Numbers of throat-associated isolates collected peaked in early December 2022, reflecting the national scarlet fever upsurge, while skin infections peaked later in December. The most common -types in 2022–2023 were 1 (28.7 %), 12 (24.9 %) and 22 (7.7 %) in throat and 1 (22 %), 12 (10 %), 76 (18 %) and 49 (7 %) in skin. While all 1 isolates were the M1 lineage, the comparison with 2016–2017 revealed diverse lineages in other -types, including 12, and emergent lineages within other types including a new acapsular 75 lineage, demonstrating that the upsurge was not completely driven by a single genotype. The analysis of the capsule locus predicted that only 51 % of throat isolates would produce capsule compared with 78% of skin isolates. Ninety per cent of throat isolates were also predicted to have high NADase and streptolysin O (SLO) expression, based on the promoter sequence, compared with only 56% of skin isolates. Our study has highlighted the value in analysis of non-invasive isolates to characterize tissue tropisms, as well as changing strain diversity and emerging genomic features which may have implications for spillover into invasive disease and future upsurges.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): emm-type , group A Streptococcus , non-invasive , skin infection , strain diversity , Streptococcus pyogenes , throat infection and whole genome sequencing
Funding
This study was supported by the:
  • Wellcome Trust (Award 227240/Z/23/Z)
    • Principle Award Recipient: ClaireE Turner
  • Wellcome Trust (Award 208765/Z/17/Z)
    • Principle Award Recipient: ClaireE Turner
© 2024 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2024-09-18
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Molecular characterization of Streptococcus pyogenes (StrepA) non-invasive isolates during the 2022–2023 UK upsurge
M Gen 10, 001277 (2024); https://doi.org/10.1099/mgen.0.001277
/content/journal/mgen/10.1099/mgen.0.001277
/content/journal/mgen/10.1099/mgen.0.001277
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