Many flat-out challenged the need for booster doses at this time. Others questioned the morality of administering third shots to Americans when most people on the planet haven’t received one. And some worried that a decision had been made before the Food and Drug Administration had ruled on the need for a booster or a key vaccine advisory committee had evaluated the data — typically the way vaccine policy is set.

The government’s top public health officials on Wednesday pointed to data showing that the mRNA vaccines developed by Pfizer-BioNTech and Moderna are no longer protecting as well against mild and moderate Covid-19 infections as evidence that “could” signal a decline in protection against serious disease.

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