Surveillance for Adverse Events After COVID-19 mRNA Vaccination

Abstract
Safe and effective vaccines against SARS-CoV-2 are critical to ending the pandemic. Two messenger RNA (mRNA) vaccines (BNT162b2, Pfizer-BioNTech; and mRNA-1273, Moderna) were the first SARS-CoV-2 vaccines authorized in the US.1,2 Large phase 3 trials for BNT162b2 and mRNA-1273 demonstrated that both vaccines were more than 94% effective against symptomatic SARS-CoV-2 infection.3,4 Neither trial reported serious safety findings, and both observed low incidence of serious adverse events.