Phase 1/2 Study to Describe the Safety and Immunogenicity of a COVID-19 RNA Vaccine Candidate (BNT162b1) in Adults 18 to 55 Years of Age: Interim Report
Mark J Mulligan,
Kirsten E. Lyke,
Stephen P. Lockhart,
Kathleen M Neuzil,
Vanessa N Raabe,
Kena A. Swanson,
Kristin R. Tompkins,
Edward E. Walsh,
Ann R Falsey,
Philip R. Dormitzer,
William C. Gruber,
Kathrin U. Jansen
Posted 01 Jul 2020
medRxiv DOI: 10.1101/2020.06.30.20142570
Posted 01 Jul 2020
Abstract In March 2020, the WHO declared a pandemic of coronavirus disease 2019 (COVID-19), due to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). With >8.8 million cases and >450,000 deaths reported globally, a vaccine is urgently needed. We report the available safety, tolerability, and immunogenicity data from an ongoing placebo-controlled, observer-blinded dose escalation study among healthy adults, 18-55 years of age, randomized to receive 2 doses, separated by 21 days, of 10 g, 30 g, or 100 g of BNT162b1, a lipid nanoparticle-formulated, nucleoside-modified, mRNA vaccine that encodes trimerized SARS-CoV-2 spike glycoprotein RBD. Local reactions and systemic events were dose-dependent, generally mild to moderate, and transient. RBD-binding IgG concentrations and SARS-CoV-2 neutralizing titers in sera increased with dose level and after a second dose. Geometric mean neutralizing titers reached 1.8- to 2.8-fold that of a panel of COVID-19 convalescent human sera. These results support further evaluation of this mRNA vaccine candidate.
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