If there’s such a thing as a date with destiny, it’s marked on Dr. Taison Bell’s calendar. At noon Tuesday, Bell, a critical care physician, is scheduled to be one of the first health care workers at UVA Health to roll up his sleeve for a shot to ward off the coronavirus. “This is a long time coming,” said Bell, age 37, who signed up through hospital email last week. “The story of this crisis is that each week feels like a year. This is really the first time that there’s genuine hope that we can turn the corner on this.”