» Pfizer and Moderna vaccines should be safe for most Americans, but 5 groups may want to wait for more data before getting shots Pfizer and Moderna vaccines should be safe for most Americans, but 5 groups may want to wait for more data before getting shots Aria BendixDec 19, 2020, 09:00 IST Margaret Keenan, the first person to be given the Pfizer coronavirus vaccine outside clinical trials.Getty The FDA authorized Moderna's coronavirus vaccine for emergency use in people ages 18 and older on Friday. Pfizer's COVID-19 shot got US clearance for people ages 16 and older a week ago. The FDA said it's up to pregnant people and their doctors to decide whether to get the vaccines.