Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Risk of adverse events within 28 days of vaccination with a bivalent omicron adapted mRNA booster vaccine as fourth dose in Danish adults aged ≥50 years from 15 September 2022 to 10 December 2022 by type of vaccine received. Each outcome was studied separately, explaining slight differences in denominators owing to different exclusions. *Corresponding number of events and person years are presented in supplementary table S3. NE=not estimable
