Charley Ding spent weeks early in the pandemic intubating patients sick with Covid-19. The 42-year-old anesthesiologist in South Barrington, Ill., said he has since watched most of the doctors and nurses he works with get infected at some point.
But he has never gotten Covid-19, he said. “It’s probably a combination of being careful, maybe being blessed with a good immune system,” he said. “But also just luck.”