my bad, since you just quoted wikipedia and I read your article, I figured you would have the courtesy to read quotes from an actual paper. Here's the cliff notes:wut? give me a connected assertion breh.
or is it random points friday?
Titers drop dramatically for MMR vaccine after a few weeks/months as well. Vaccines still served to eradicate MMR from the developed world for the most part (it is experiencing a resurgence now due to vax hesitancy.)
Antibodies aren't the only way to prove immunity which is why many medical professionals recommended against the antibody tests.
With that said, my guess is that part of the reason prior vaccines have been so effective is that if everyone gets vaxxed at once, then the virus has less chance to spread even as the antibodies wane. However, in a situation where the body has to repeatedly fight off the virus, that may not be enough. Long story shory, herd immunity worked back in the day but we are struggling now.
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