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[–] CowWithBeef 0 points 1 point (+1|-0) ago 

customers for life

This is especially true for the chicken pox(varicella) vaccine. That shit wears off and you either get another dose or risk getting shingles.

The reduced rate of kids having it also means immune adults who had the disease may go decades without re-exposure which risks their immune systems forgetting how to deal with it.

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[–] jonnyquest ago 

I recall reading that naturally developed immunity doesn't disappear like vaccine-induced "sensitization" immunity -- but you raise a very good point should this not be the case...!