How long is MMR vaccine good for?

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  1. #several
  2. #decline
  3. #virtually
  4. #gradually
  5. #protected
  6. #lower
  7. #appears
  8. #mumps
  9. #rubella
  10. #doses
  11. #everyone
  12. #protection
  13. #after
  14. #against
  15. #years
  16. #measles
  17. #little