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Separating the MMR vaccine into individual shots is likely to produce more missed doses and more sick kids. The MMR is a single injection covering measles, mumps, and rubella.
It is now the target of a White House executive order calling for it to be broken into separate shots for each disease. The history of where that vaccine came from helps explain why the change carries real risk.
What the executive order calls for President Trump's executive order directs vaccine makers to split the MMR into its component parts. What was signed is an instruction to manufacturers.
What it cannot sign into existence is a guarantee that children's vaccination rates hold steady when the appointment count triples.
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