The Four Possible Timelines for Life Returning to Normal

There are two realistic paths to achieving this “population-level immunity.” One is the development of a vaccine. The other is for the disease to work its way through the population, surely killing many, but also leaving many others—those who contract the disease and then recover—immune. “They’re just Teflon at that point,” meaning they can’t get infected again and they won’t pass on the disease, explains Andrew Noymer, a public-health professor at the University of California at Irvine.  …“Prematurely ending severe social distancing would be an incredible blunder that would have major human consequences,” Noymer told me. “What is ‘prematurely’? The truth is, we don’t know yet, exactly, but it’s longer than a fortnight. It could be eight to 12 weeks.”