A patient in a biocontainment unit is carried on a stretcher from an ambulance at a Rome hospital in March.

A patient in a biocontainment unit is carried on a stretcher from an ambulance arrived at the Columbus Covid 2 Hospital in Rome, Tuesday, March 17, 2020. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness, especially in older adults and people with existing health problems. (AP Photo/Alessandra Tarantino)