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Here's how the vaccine schedule would work:
Day 0: Get your first shot
Day 21: Get your second shot
Day 28: Where Pfizer has done their interim analysis on protection
Day 28 after injection is where you get the claimed (not yet verified) protection level from. It's important to understand that you will not be immune immediately after getting the first injection (and the degree of protection at those snapshots in time is either not known or hasn't been released).
As a comparison, the body takes about 14 days to mount a full protective immune response from the flu vaccine. So if I get a shot today and get exposed on Sunday and come down with influenza, it doesn't mean I the shot gave me the flu (it can't). That's where a lot of the misunderstanding of "I got a flu shot and then got the flu" comes from.
Also, we need to think about this in terms of scale. Not everyone will get this initially, and immunity will not be instantaneous. Thus, we will still need mitigation strategies for several more months (masks, distancing, handwashing). Be patient.
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"When the Know-Nothings get control, it will read 'all men are created equal, except negroes, and foreigners, and Catholics.' When it comes to this I should prefer emigrating to some country where they make no pretense of loving liberty – to Russia, for instance, where despotism can be taken pure, and without the base alloy of hypocrisy.”--Abraham Lincoln
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