People wear face masks as they sit on the Shaftesbury Memorial Fountain in Piccadilly Circus, in London, Friday, March 13, 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.(AP Photo/Alberto Pezzali)

March 13, 2020