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November 21, 2025Science AdvancesOpen Access

Conserved CD8 T cell vaccines without B cell epitopes drive robust protection against SARS-CoV-2 that is enhanced by intranasal boost

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Authors

GCGenghao ChenTNThao NguyenLMLindsay G. A. McKay

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Overview

Immunizations with CD8 T cell epitopes reduced lung viral load in mice, suggesting mucosal vaccines could enhance T cell immunity against SARS-CoV-2.

Key Points

  • This research aims to evaluate the effectiveness of CD8 T cell vaccines targeting conserved epitopes against SARS-CoV-2.
  • Identified Omicron BA.1-specific and Wuhan-conserved CD8 T cell epitopes in SARS-CoV-2 spike protein.
  • Administered carrier-protein fusion vaccines through subcutaneous immunizations in mouse models.
  • Conducted intranasal boosting to enhance T cell responses.
  • Subcutaneous immunizations significantly lowered lung viral load after a low-dose viral challenge.
  • Intranasal boosting improved lung resident memory T cell responses.
  • CD8 T cell vaccines conferred durable protection against high-dose infections.

Cite This Study

Chen et al. (2025) studied this question.

synapsesocial.com/papers/6924e3ecc0ce034ddc34ece1https://doi.org/10.1126/sciadv.adx0037
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