• Very very simply if you've got three people and 2 doses of vaccine for now, then all three are better protected if 2 of them get a dose but wait longer for a second than 1 getting both doses quickly, even the 1 missing out on the second dose because they're less likely to get Covid from the person with the other first dose and the no dose person gets protection too. The person who missed out on their early second dose may be better or worse off personally as far as protection goes, but that's not been tested because if it was then there would be no doses yet for anyone.

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