Story perspectives
CDC's MMR Shot Split Faces Backlash from Experts, Merck
10/7/2025
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Story summary
- On October 6, 2025, the Centers for Disease Control and Prevention acting director Jim O'Neill called for three separate measles-mumps-rubella (MMR) shots, echoing President Trump's statements.
- Merck & Co. opposes the plan, citing no scientific evidence.
- Health experts warn splitting could raise missed appointments and costs for families.
- The U.S. Food and Drug Administration does not license separate MMR vaccines.
