Medical personnel discuss patients that had been admitted for testing for the coronavirus at the entrance Central Maine Medical Center on Friday, March 13, 2020, in Lewiston, Maine. U.S. hospitals are setting up circus-like triage tents, calling doctors out of retirement, guarding their supplies of face masks and making plans to cancel elective surgery as they brace for an expected onslaught of coronavirus patients. (AP Photo/Robert F. Bukaty)