If the vaccine just protects you and doesn't keep you from infecting others, then why are perfectly healthy 23-year-old healthcare workers getting it while there's still so many people over 65 waiting for it? And if it does keep you from infecting others, then why do you need to keep following the mask and social distancing rules even after you get it?
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The answer is that we don't know. We think it works but we don't know for sure, only time will tell.