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Peer-reviewedCC BY 4.0Emerging Infectious Diseases

Post–COVID-19 Expansion of Streptococcus pyogenes Lineages Causing Toxic Shock Syndrome, Japan, 2023–2024

  • Tadayoshi Ikebe
  • Hitoshi Otsuka
  • Mari Sasaki
  • Takahiro Yamaguchi
  • Yoshimi Date
  • Yu Kazawa
  • Kazuki Saito
  • Kaho Ikeda
  • Rumi Okuno
  • Yukihiro Akeda
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Abstract

We analyzed 919 Streptococcus pyogenes isolates from laboratory-confirmed streptococcal toxic shock syndrome cases in Japan during 2023–2024. Post–COVID-19 resurgence was driven by expansion of M1UK (49.8%) and emerging M113SNPs (37.4%) lineages, replacing ancestral M1global. M113SNPs were associated with younger patient age and higher death rates in unadjusted analyses.

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Cite

BibTeXRIS
BibTeX
@article{ikebe2026postcovid19,
  title = {{Post–COVID-19 Expansion of Streptococcus pyogenes Lineages Causing Toxic Shock Syndrome, Japan, 2023–2024}},
  author = {Tadayoshi Ikebe and Hitoshi Otsuka and Mari Sasaki and Takahiro Yamaguchi and Yoshimi Date and Yu Kazawa and Kazuki Saito and Kaho Ikeda and Rumi Okuno and Yukihiro Akeda},
  journal = {Emerging Infectious Diseases},
  year = {2026},
  month = oct,
  doi = {10.3201/eid3211.260336},
  url = {https://doi.org/10.3201/eid3211.260336},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Post–COVID-19 Expansion of Streptococcus pyogenes Lineages Causing Toxic Shock Syndrome, Japan, 2023–2024
AU  - Tadayoshi Ikebe
AU  - Hitoshi Otsuka
AU  - Mari Sasaki
AU  - Takahiro Yamaguchi
AU  - Yoshimi Date
AU  - Yu Kazawa
AU  - Kazuki Saito
AU  - Kaho Ikeda
AU  - Rumi Okuno
AU  - Yukihiro Akeda
PY  - 2026
DA  - 2026/10/30
JO  - Emerging Infectious Diseases
DO  - 10.3201/eid3211.260336
UR  - https://doi.org/10.3201/eid3211.260336
AB  - We analyzed 919 Streptococcus pyogenes isolates from laboratory-confirmed streptococcal toxic shock syndrome cases in Japan during 2023–2024. Post–COVID-19 resurgence was driven by expansion of M1UK (49.8%) and emerging M113SNPs (37.4%) lineages, replacing ancestral M1global. M113SNPs were associated with younger patient age and higher death rates in unadjusted analyses.
SN  - 1080-6040
SN  - 1080-6059
ER  -