CDC panel recommends Pfizer boosters for older and some higher-risk Americans, with agency expected to accept recommendation

Because the FDA authorization pertains only to third doses of the Pfizer-BioNTech vaccine, and federal guidance encourages consumers to get boosters from the maker of their original doses, many policy questions remain about implementation. State health officials, hospital administrators and clinicians need guidance now, they say, on whether they can mix and match booster shots from the two other authorized vaccines, Moderna and Johnson & Johnson.