There's a reason the efficacy rates, even from those early, astonishingly good clinical trial results, were, like, 94%. Note that 94% is not 100%!https://twitter.com/kingdomofwench/status/1417192916389441540 …
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enough people doing those things (ideally being required to do those things!) consistently enough—this is the societal part!—means the virus can't spread through the population very effectively, which comes back around to reduce that initial chance of exposure.
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