Scientists have known for years that measles can alter the immune system – but the latest evidence suggests it's less of a mild tweaking, and more of a total reset.
So, even if you had been immune, through previous illness, vaccination or via maternal milk, you may not be anymore after having measles.
I had never heard this until today, and it's an absolutely horrifying thought.
Unfortunately having the vaccine isn’t a guarantee that you cannot be infected. Herd immunity can do that, but that requires mostly everyone getting the vaccine.
So, even people that are vaccinated will be affected by people refusing the vaccine.
It's not a 100% guarantee, but it's a 93% to 97% garantee, and even if you are one of the unlucky 1 in 20 that was vaccinated and still gets it, it's a much less severe case, and you're much less likely to spread it.
So it's real close to being a guarantee. It's a highly effective vaccine.