The acting director of the U.S. Centers for Disease Control and Prevention called for vaccine makers to develop separate shots against measles, mumps and rubella to replace combination MMR vaccines, despite no evidence of any benefit to getting the shots separately.

“I call on vaccine manufacturers to develop safe monovalent vaccines to replace the combined MMR and ‘break up the MMR shot into three total separate shots, ’” Jim O’Neill, who also serves as deputy secretary of the U.S. Department of Health and Human Services, wrote in a post on X on Monday. He quoted from a Sept. 26 post by President Donald Trump.

The president didn’t give a reason when he called for breaking up the vaccine, which has been approved as a combination in the U.S. since 1971. The CDC says on its website

See Full Page