Vaccine makers are preparing for a next possible phase of the Covid-19 vaccine rollout: booster doses.
CNN’s Dr. Sanjay Gupta reports on these booster studies.
In-Depth: Will COVID-19 booster shots be needed?
The CEOs of Pfizer and Moderna say they think boosters will be needed within a year of immunization, potentially as early as..
ABC 10 News | San Diego
