It has been long observed that, after disease ravages a group of animals, the remaining herd often comes to possess a collective immunity. That's one reason some epidemics seem to appear and flame out just as suddenly. But is that a good strategy for a human population fighting COVID-19, as some public figures have wishfully suggested? In this episode, the deans discuss why that is a very bad idea, and how we’ll be better off getting through this winter with clear, constant communication from respected public health institutions.