Medical staff members arrive for a duty shift at Dongsan Hospital in Daegu, South Korea, Wednesday, March 18, 2020. For most people, the new coronavirus causes only mild or moderate symptoms, such as fever and cough. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia. (Lee Moo-ryul/Newsis via AP)

March 18, 2020