In mid-2019, there was a small outbreaks of measles in my province. The theatre where my husband had attended a show advised he was exposed to someone infected, so he should check with his doctor to ensure he was fully vaccinated.

Both of us have had multiple doctors since we were children, so contacting them wasn't possible. To make a long story short, it took about 6 phone calls back and forth between different members of public health and our current doctor to determine we weren't fully vaccinated.

IIRC, it breaks down like this: People older than us received that massive booster shot and were fully immunized by it. People younger than us received two shots a little while apart, making them fully immunized. But we fell into some strange time in-between where we both only got one dose of the vaccine.

Obviously where you lived will impact what you may have received, but my spouse and I are 6 years apart and grew up in different provinces.

But all this to say, that every healthcare worker we talked to along the journey was surprised to find this vaccination gap existed, so it's worth checking to make sure you are in fact properly immunized.