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  • Babies younger than 1 year old.
  • Children over 1 year of age who have not received at least 1 dose of mumps vaccine (MMR vaccine).
  • Adults born in or after 1957 who have not been vaccinated or have not had mumps before.
  • During outbreaks, immunized people who have close contact with people who have mumps may become infected. A third dose of mumps vaccine may be recommended during outbreaks