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.

This question is for testing whether you are a human visitor and to prevent automated spam submissions.