Crystal is a Pennsylvania teacher contemplating a life-defining decision. Her husband has dermatomyositis, a disorder that weakens his muscles and his immune system. Crystal herself has asthma, and so does her 5-year-old son, who may start kindergarten in the fall. On occasion, he has coughed until he’s vomited, unable to catch his breath. For her, getting COVID-19—or worse, bringing it home—is a huge concern.