I found this info on a CDC site:
As an adult, do I need the MMR vaccine?
You do not need the MMR vaccine if you
- had blood tests that show you are immune to measles, mumps, and rubella
- are someone born before 1957
- already had two doses of MMR or one dose of MMR plus a second dose of measles vaccine
- already had one dose of MMR and are not at high risk of measles exposure
“People born before 1957 lived through several years of epidemic measles before the first measles vaccine was licensed. As a result, these people are very likely to have had the measles disease. Surveys suggest that 95% to 98% of those born before 1957 are immune to measles. Note: The “1957 rule” applies only to measles and mumps—it does NOT apply to rubella.”
