Here's what to know if you're unsure about your measles immunity status
Measles is the kind of virus that makes epidemiologists nervous for a reason. It can hang in the air for a couple of hours after someone coughs, which means you could walk into an empty room and still catch it. That's why the question of whether you're actually immune matters more than it sounds.
Most adults who got one MMR shot as kids are probably fine. But immunity can wane, and if you were vaccinated long ago, heading somewhere an outbreak is brewing, or working in a hospital, the rules shift. The guidance here is essentially saying: if you're unsure, just get the second dose. It's low-risk and high-reward, and the cost of being wrong is a miserable illness you don't want.
I'd want to know more about how people are supposed to check their status, whether there's a simple blood test or if the answer is just to roll up your sleeve. The honest take seems to be that a booster is rarely a bad idea, and given how easily this virus spreads, I'd rather be over-vaccinated than play guessing games with my immune memory.