The newly formed vaccine advisory committee handpicked by Health and Human Services Secretary Robert F. Kennedy Jr. announced that it would examine the cumulative effect of the childhood vaccine schedule and reevaluate hepatitis B immunization recommendations — a move that could shift long-standing practices of how and when children are immunized in the United States.

It is unclear how Kennedy’s new members, including Dr. Robert Malone, will affect the panel’s vaccine recommendations.

A former leader of the anti-vaccine group Children’s Health Defense will present this week on thimerosal in flu vaccines at a meeting of the newly appointed vaccine advisers to the US Centers for Disease Control and Prevention,