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  • MMR (Measles, Mumps, and Rubella)
  • Vaccine Safety

A few parents are asking that their children receive separate components of the MMR vaccine because they fear MMR may be linked to autism. What should I do?

Merck no longer produces single antigen measles, mumps, and/or rubella vaccines for the U.S. market. Only combined MMR is available. You should educate parents about the lack of association between MMR and autism. You may provide parents with’s parent handout (developed in collaboration with the Autism Science Foundation): Evidence Shows Vaccines Unrelated to Autism, found at

Last reviewed: June 19, 2023

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