The acting director of the Centers for Disease Control and Prevention on Monday endorsed President Trump’s call to split up the measles, mumps, and rubella vaccine despite there being no research to support such a massive change.

“I call on vaccine manufacturers to develop safe monovalent vaccines to replace the combined MMR and ‘break up the MMR shot into three totally separate shots’,” Jim O’Neill posted on X, linking to an earlier post from Trump where he told pregnant women not to take Tylenol, called for breaking up the MMR shot and said the hepatitis B vaccine should be delayed until kids are at least 12 years old.

O’Neill gave no reason why he thinks separating the shots and spreading them out over time would be beneficial, but his comments build on the administration’s public ske

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