The new members of the CDC's vaccine advisory panel hear presentations on Covid-19 at their meeting September 19 in Atlanta. Alyssa Pointer/Reuters

About 90 seconds into his presentation on Covid-19 vaccine safety at a closely watched meeting of advisers to the US Centers for Disease Control and Prevention last month, Dr. Bruce Carleton made a startling revelation: The government grant supporting his research had been abruptly terminated.

The statement was surprising for a few reasons. Carleton had been asked to share his findings with a group entirely put in place by US Health and Human Services Secretary Robert F. Kennedy Jr. after Kennedy summarily dismissed all 17 previous experts on the committee, known as the Advisory Committee on Immunization Practices or ACIP, in June. In i

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