[daft_pink]

If you were vaccinated on the normal schedule, what year would you generally be born to be vaccinated with the single dose?

[js2]

In the U.S., the second dose was added in 1989 so around then. You might've also gotten a booster in the U.S. if you were born earlier but lived in a college dormitory.

If you're not sure, get tested. It's a simple blood draw.