US Health and Human Services Secretary Robert F. Kennedy Jr. fired the sitting members of the CDC's vaccine advisory committee this year and picked new members. They will meet Thursday and Friday. Andrew Harnik/Getty Images

Vaccine advisers to the US Centers for Disease Control and Prevention may vote this week to make a major change to the childhood vaccine schedule, potentially delaying a dose of the hepatitis B vaccine given to newborns by weeks or even years.

The members of the Advisory Committee on Immunization Practices were handpicked by US Health and Human Services Secretary Robert F. Kennedy Jr., a longtime anti-vaccine activist, after he abruptly fired the 17 sitting members this year. The agenda for this week’s meeting offers few details beyond discussion and a vote about

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