Moderna formally requested the FDA grant emergency authorization for a second booster shot of its COVID-19 vaccine for all adults over 18 who have received approved vaccines. Earlier this week, Pfizer and its partner BioNTech also requested authorization for a second booster shot, but only for people over 65 who have been vaccinated.

Both companies said their requests were based in part on data from Israel, after the emergence of the Omicron variant, that showed a second booster lowers rates of infection and severe illness. Moderna said it sought authorization for everybody over 18 to give government health authorities flexibility in deciding which age groups would most benefit from the booster. Read more here.