Trump’s HHS and NIH are planning to invest $500 million in a killed-whole-virus approach to universal vaccines, including such vaccines for flu and COVID. Here’s why that’s challenging

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."

The Department of Health and Human Services says it will require new vaccines to be tested against a placebo, which could complicate and delay Food and Drug Administration approval of many vaccines.