U.S. health officials may soon recommend COVID-19 booster shots for fully vaccinated Americans. A look at what we know about boosters and how they could help fight the coronavirus:
Coronavirus
Associated Press: What do we know about booster shots for COVID-19?

A woman receives a dose of vaccine against the coronavirus disease (COVID-19) in the vaccination center established in the International Exhibition Center in Kyiv on May 29, 2021.