Emerging evidence that vaccination protects better than prior infection. Yet another reason why herd immunity via natural infection is not the way to go! Mutated virus may reinfect people already stricken once with covid-19, sparking debate and concerns
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That's not how these more modern vaccines work:
health.harvard.edu/blog/why-are-m
They're designed to have your cells produce a bunch of a protein which is a weak point of the virus and shared by the variants. Your immune system finds it and specifically learns to target that protein.