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RE: More MUMPS Outbreaks!! The Vaccine has FAILED -- Yet UnVaccinated Still Get the Blame
As I said in the article, it seems that in Canada you probably only had 1 dose of MMR if you are over 21. Unless your parents took you in when you were older for a booster, but I don't know how often that was pushed or happened.
It was a very straightforward question that was actually answered in the article you linked.