The mechanism of action of the vaccines is to prime immune response to reduce severity of infection. They are not sterilising so no mechanism to address viral shedding and therefore spreading. Inventor of mRNA vaccine technology says so. 5:30 in.https://youtu.be/DyjuSog8VoY
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They are not and never have been 100% effective. Hence minimizing exposure to a level of personal tolerance is wise.
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