Charles Krupa, The Associated Press
FILE – In this Thursday, Feb. 25, 2021 file photo, vials for the Moderna and Pfizer COVID-19 vaccines are displayed on a tray at a temporary clinic set up by the New Hampshire National Guard in the parking lot of a high school in Exeter, N.H. The Food and Drug Administration ruled that transplant recipients and other similarly immune-compromised patients can get a third dose of either the Pfizer or Moderna vaccine. But the decision, late Thursday night, Aug. 12, 2021, offers an extra dose only to those high-risk groups — not the general public.