The U.S. is talking about a second round of COVID-19 booster shots, and it’s going to be even more complicated than last year
March 25, 2022 at 13:32 PM EDT
Health officials are already talking about rolling out a fourth dose of the COVID-19 vaccine in the U.S. although there are still questions about the efficacy, timing, availability, and formulation of the next round of shots.
