A startling new vision of vaccination in America is becoming clearer — one likely to involve fresh scrutiny of established science and practices, and limits on vaccines that have been studied for decades.

ATLANTA -- U.S. Health Secretary Robert F. Kennedy Jr.’s new vaccine advisers began their first meeting Wednesday under intense scrutiny from medical experts worried about Americans’ access to lifesaving shots.

A panel of vaccine advisers handpicked by Robert F. Kennedy Jr. concluded a two-day meeting with votes to limit the availability of certain flu vaccines. Their concern is a preservative that has been a source of controversy despite ample evidence that it is safe.