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@nycetmz Apparently it's not, and for a rather short-sighted reason. If you get chickenpox, you have the potential to have it flare up again at an adult in the form of shingles. BUT if you are exposed to chicken pox repeatedly as an adult (via the children around you continuing to get chicken...

@7thunders So there is such a thing as "immune amnesia" with measles. When you catch measles, it not only makes you sick, but it also destroys your body's immune memory cells, making all your previous vaccinations and illness exposures worthless. Your immune system resets, essentially. After...