Very good article, thank you!

My thinking is that even with a vaccine we may need to retain some limited degree of social distancing. 60% immune is a lot unless we get a vaccine more effective than for flu and a very high percentage taking it. BUT if a modest amount of social distancing (maybe avoid really big crowds, keep a distance when reasonable...) plus extra hand washing, will reduce the reproductive number to, say, 1.5, then we only need 33% immune -- that's more attainable.

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