They're finding that the MMR vaccinations we probably got as kids ARE useful but wear off after several decades. I had to take another one when I started Nursing School, even though I had the original vac. card from 1960.My dr just had me take a MMR titer. Not sure why. Might be a new medical thing for people over 65.
Titers seem to be the Gold Standard for vaccination verafication today. We have to take them all the time. It depends on the facility. (Its a blood test to look for specific antibodies.)