iScience (Jan 2023)

An extended SARS-CoV-2 mRNA vaccine prime-boost interval enhances B cell immunity with limited impact on T cells

  • Alexandre Nicolas,
  • Gérémy Sannier,
  • Mathieu Dubé,
  • Manon Nayrac,
  • Alexandra Tauzin,
  • Mark M. Painter,
  • Rishi R. Goel,
  • Mélanie Laporte,
  • Gabrielle Gendron-Lepage,
  • Halima Medjahed,
  • Justine C. Williams,
  • Nathalie Brassard,
  • Julia Niessl,
  • Laurie Gokool,
  • Chantal Morrisseau,
  • Pascale Arlotto,
  • Cécile Tremblay,
  • Valérie Martel-Laferrière,
  • Andrés Finzi,
  • Allison R. Greenplate,
  • E. John Wherry,
  • Daniel E. Kaufmann

Journal volume & issue
Vol. 26, no. 1
p. 105904

Abstract

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Summary: Spacing the first two doses of SARS-CoV-2 mRNA vaccines beyond 3–4 weeks raised initial concerns about vaccine efficacy. While studies have since shown that long-interval regimens induce robust antibody responses, their impact on B and T cell immunity is poorly known. Here, we compare SARS-CoV-2 naive donors B and T cell responses to two mRNA vaccine doses administered 3–4 versus 16 weeks apart. After boost, the longer interval results in a higher magnitude and a more mature phenotype of RBD-specific B cells. While the two geographically distinct cohorts present quantitative and qualitative differences in T cell responses at baseline and after priming, the second dose led to convergent features with overall similar magnitude, phenotype, and function of CD4+ and CD8+ T cell responses at post-boost memory time points. Therefore, compared to standard regimens, a 16-week interval has a favorable impact on the B cell compartment but minimally affects T cell immunity.

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