iScience (May 2024)

A spike virosome vaccine induces pan-sarbecovirus antibody responses in mice

  • Mitch Brinkkemper,
  • Meliawati Poniman,
  • Esther Siteur-van Rijnstra,
  • Widad Ait Iddouch,
  • Tom P.L. Bijl,
  • Denise Guerra,
  • Khadija Tejjani,
  • Marloes Grobben,
  • Farien Bhoelan,
  • Denzel Bemelman,
  • Ronald Kempers,
  • Marit J. van Gils,
  • Kwinten Sliepen,
  • Toon Stegmann,
  • Yme U. van der Velden,
  • Rogier W. Sanders

Journal volume & issue
Vol. 27, no. 5
p. 109719

Abstract

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Summary: Zoonotic events by sarbecoviruses have sparked an epidemic (severe acute respiratory syndrome coronavirus [SARS-CoV]) and a pandemic (SARS-CoV-2) in the past two decades. The continued risk of spillovers from animals to humans is an ongoing threat to global health and a pan-sarbecovirus vaccine would be an important contribution to pandemic preparedness. Here, we describe multivalent virosome-based vaccines that present stabilized spike proteins from four sarbecovirus strains, one from each clade. A cocktail of four monovalent virosomes or a mosaic virosome preparation induced broad sarbecovirus binding and neutralizing antibody responses in mice. Pre-existing immunity against SARS-CoV-2 and extending the intervals between immunizations enhanced antibody responses. These results should inform the development of a pan-sarbecovirus vaccine, as part of our efforts to prepare for and/or avoid a next pandemic.

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