Nationwide safety surveillance of COVID-19 mRNA vaccines following primary series and first booster vaccination in Singapore
Background: The real-world safety profile of COVID-19 mRNA vaccines remains incompletely elucidated.Methods: We performed a nationwide post-market safety surveillance analysis in Singapore, on vacinees aged 5 years and older, through mid-September 2022.Observed-over-expected (O/E) analyses were performed to identify potential safety signals among e