re: What purposes does the vaccine serve for people that have beaten covid?

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Possible / likely reason? Moderna is simply a bigger inoculation.

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But the other difference is that Moderna gives the 2nd dose after four weeks, vs three weeks with Pfizer. And we're learning that more of a delay between doses produces stronger immunity.

But to OP's original question: there are now several studies showing that natural immunity + one shot gives the strongest protection of anything. If I'd had COVID, I would only get one shot, though. If I got a 2nd shot, it would only be for stuff like foreign travel or Saints games, etc.