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The first time your body sees an infection it makes a first wave of antibody producing cells. If you dont see the virus or bacteria again, those cells go away, this usually takes between 6-18 months.Surely protection for most diseases is much longer than that? Although you do of course hear about booster shots for some diseases, for many you do not. I would assume 6-18 months is at the very low end, otherwise childhood vaccinations would be useless by adulthood.


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