Hospitals have put their pandemic plans into action, adding more beds and creating makeshift COVID-19 wards. But in the hardest-hit areas, there are simply not enough doctors, nurses, and other specialists to staff those beds. Some health-care workers told me that COVID-19 patients are the sickest people they’ve ever cared for: They require twice as much attention as a typical intensive-care-unit patient, for three times the normal length of stay. “It was doable over the summer, but now it’s just too much,” says Whitney Neville, a nurse based in Iowa. “Last Monday we had 25 patients waiting in the emergency department. They had been admitted but there was no one to take care of them.” I asked her how much slack the system has left. “There is none,” she said.