NEW YORK and MAINZ, GERMANY, NOVEMBER 16, 2022 — Pfizer Inc. (NYSE: PFE) and BioNTech SE (Nasdaq: BNTX) today announced that the companies have initiated a Phase 1 study to evaluate the safety, tolerability and immunogenicity of a next generation COVID-19 vaccine candidate that aims to enhance SARS-CoV-2 T cell responses and potentially broaden protection against COVID-19. This candidate, BNT162b4, is composed of a T cell antigen mRNA encoding for SARS-CoV-2 non-spike proteins that are highly conserved across a broad range of SARS-CoV-2 variants and will be evaluated in combination with the companies’ Omicron BA.4/BA.5-adapted bivalent COVID-19 vaccine. These non-spike proteins have been chosen based on BioNTech's proprietary target prioritization platform and were designed into a vaccine candidate with the purpose of enhancing and broadening T cell immunity and potentially extending durability of protection against COVID-19.