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  • MMR (Measles, Mumps, and Rubella)
  • For Healthcare Personnel

If a healthcare worker develops a rash and low-grade fever after MMR vaccine, is the person infectious?

Approximately 5 to 15% of susceptible people who receive MMR vaccine will develop a low-grade fever and/or mild rash 7 to 12 days after vaccination. However, the person is not infectious, and no special precautions ( such as exclusion from work) need to be taken.

Last reviewed: June 19, 2023

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