Reminder that you can have your measles immunity tested as an adult, and get a booster if needed, the latter for free (for now, until MAHA fucks that up too).
If you were vaccinated then it’s a lifelong immunity. You really only need to test immunity if you are unsure if you got the vaccine (generally done with the MMR but there’s a standalone vaccine as well). Not trying to discourage anyone from testing, but if you were vaccinated when you were a kid then you don’t need to be overly concerned.