Panel Backs Monovalent XBB Variant Covid Vaccine
FDA’s Vaccines and Related Biological Products Advisory Committee 6/15 voted 21 to 0 that the Covid-19 vaccination program for the 2023-2024 season should contain a monovalent vaccine comprising the XBB-lineage variant.
Panel members essentially agreed with an FDA briefing document released in advance of the meeting that stated: “while vaccines based on the original virus strain can still be protective against severe disease, protection wanes with time and is reduced against subsequent waves of variant viruses. Both real-world evidence and immunogenicity data suggest that a vaccine composition that more closely matches circulating virus strains can significantly improve vaccine-induced immunogenicity and protection.”
Agency reviewers said that the current sublineages under consideration include XBB.1.5, XBB.1.16, or XBB.2.3. The three variants have a similar spike protein, and a vaccine that targets any of the three should be effective, experts told the panel. The three vaccine makers — Pfizer-BioNTech, Moderna, and Novavax — indicated that they can produce sufficient supplies by September.