A Department of Health and Human Services spokesperson called the move "a radical departure from past practices."

The top US health department plans to require placebo testing for all vaccines in an effort to offer "straightforward" public health information, but experts say such testing could limit availability and raise ethical concerns.

Per the Post, which first reported the story, “‘All new vaccines will undergo safety testing in placebo-controlled trials prior to licensure — a radical departure from past practices,’ an HHS spokesperson told The Washington Post in response to questions about Kennedy’s comments on the measles vaccines and general vaccine policy."