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[–] Gravspeed ago 

It's just like why the flu shot isn't always effective, the more a virus can reproduce the more it mutates, the more it mutates the less effective the vaccine. When you have millions of human petri dishes running around that mutation happens pretty fast.

Research herd immunity.

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

Moo