https://www.mercurynews.com/2022/03/29/fda-authorizes-second-booster-for-50-as-stealth-omicron-subvariant-dominates-u-s/ > The FDA said Tuesday that people age 50 and older may get a second Pfizer or Moderna COVID-19 booster shot four months after their first as the highly contagious omicron subvariant BA.2 was reported to account for more than half of U.S. cases. > The Food and Drug Administration also said those who have had organ transplants or otherwise have compromised immunity may get a second booster by Pfizer if they are age 12 or older or by Moderna if they are age 18 or older.