Why no vaccine can ever be 100% effective: Wide variation in the population's immune systems mean guaranteed protection is impossible | WHAT REALLY HAPPENED

Why no vaccine can ever be 100% effective: Wide variation in the population's immune systems mean guaranteed protection is impossible

The announcement of not one but three coronavirus vaccines has been widely welcomed, in particular, their effectiveness.

Submitted by mayaleo on Tue, 12/01/2020 - 11:58
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