The cancellation plays into fears among scientists who worry that Robert F. Kennedy Jr. will use his position as health secretary to sow doubts about vaccines.

An FDA advisory committee meeting scheduled next month to decide the composition of next season’s flu vaccines has been canceled without any explanation, Paul Offit, a professor of pediatrics and a panel member,

A meeting of a committee which advises the U.S. Food and Drug Administration on vaccine policy has been canceled, a committee member told Reuters, the second such disruption to a federal vaccine advisory panel since Robert F.