Who should be getting a 2nd coronavirus booster shot? Our medical expert explains

On Tuesday, the US Food and Drug Administration expanded its authorization of the Pfizer/BioNTech and Moderna Covid-19 vaccines. Now, adults ages 50 and older are able to get a second booster if at least four months have passed since their first one.On Tuesday, the US Food and Drug Administration expanded its authorization of the Pfizer/BioNTech and Moderna Covid-19 vaccines. Now, adults ages 50 and older are able to get a second booster if at least four months have passed since their first one.