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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.

“Most Torontonians are definitely not at risk. We know that most children who attend school in Toronto have vaccination rates above 90 per cent for two doses of the vaccine and most individuals who were born before 1970 had mumps as a child,” Dubey said.