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Jan Wildeboer 😷:krulorange:

TL;DR Paper on current BioNTech/Pfizer XBB.1.5 vaccine shows strong answer to XBB variants and EG.5 (Eris) and BA.2.86 (Pirola). medrxiv.org/content/10.1101/20

Abstract: SARS-CoV-2 Omicron XBB subvariants efficiently evade immunity from prior infection or vaccination, requiring vaccine adaptation. Here, we analyzed immunogenicity of an adapted vaccine, BNT162b2 Omicron XBB.1.5, which is currently used for booster vaccination. Booster vaccination significantly increased anti-Spike IgG, accompanied by expansion of cross-reactive memory B cells recognizing Wuhan and Omicron XBB.1.5 spike variants. Geometric mean neutralizing titers against XBB.1.5, XBB.1.16 and XBB.2.3, as well as cross-reactive responses against EG.5.1 and BA.2.86 increased significantly relative to pre-booster titers. Finally, the number of Wuhan and XBB.1.5 spike reactive IFN-y-producing T cells significantly increased after booster vaccination. In summary, BNT162b2 Omicron XBB.1.5 vaccination resulted in potent neutralizing antibody responses against Omicron XBB variants, including the recent Omicron variants EG.5.1 (Eris) and BA.2.86 (Pirola), as well as XBB.1.5 reactive T cell responses, suggesting that booster vaccination will augment protection against these emerging variants.
Nov 04, 2023, 09:42 AM·Public
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