So this vid is regarding bacteria, not viruses like measles, but it's an insanely good illustration of just how quickly evolution happens on a microscopic scale:
https://www.youtube.com/watch?v=plVk4NVIUh8
This is why finishing your entire antibiotic prescription is so important even if you feel better after it's half way done: if there are a few remaining cells that are less susceptible to the drug, you want to really overwhelm them so they're fully dead. Allow them to recover and multiply, and you just bred up a new strain of superbug. We don't give them a bridge of progressively higher doses for them to adapt to, we go straight to dropping nukes.
So back to viruses. These antivax dipshits are basically offering themselves and their children up as petri dishes for the virus to not just thrive in, but to mutate in. If a single one of those microscopic fuckers mutates in a way that bypasses your immune defenses granted by a vaccine, then we're literally one sneeze away from being back to square one with no measles vaccine, cuz the one we have just become obsolete. Fast forward a few months worth of spreading from host to host in a world full of international travel, and boom, there's our next global pandemic.
The decision to vaccinate or not is NOT a personal choice: it's a communal one. Even ignoring the outliers like immunocompromised people who rely on herd immunity, choosing not to vaccinate is rolling the dice for the fates of literally everyone. No needle is that scary - just fucking do it.
This antivax shit is some of the most maliciously selfish nonsense that humans are capable of.
