“Obviously the safest thing to do would be to shut down and stay in our houses until a vaccine appears — but we can’t do that,” Dr. Jonathan Samet, dean of the Colorado School of Public Health, told me. With a vaccine unlikely to be developed this year, Samet said leaders must decide how to reengage society with the virus still at play. “It’s far more complex balancing the economy against the epidemiology here,” he said, “but we’ve got to find that balance.”