A federal advisory committee on Friday postponed a planned vote on whether to delay some newborn infants’ first hepatitis B vaccine dose, throwing into disarray the second day of a scrutinized meeting held to evaluate changes in the childhood immunization schedule.

The Centers for Disease Control and Prevention panel, which Health and Human Services Secretary Robert F. Kennedy Jr. recast to his liking in June and padded further this week , questioned both the safety and the necessity of the hepatitis B vaccine in discussions Thursday ahead of Friday’s vote.

Eleven members of the Advisory Committee on Immunization Practices, or ACIP, voted to table the vote indefinitely, while one, committee chair Martin Kulldorff, voted no. They had been considering whether vaccination should be with

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