Students, some wearing protective masks as a precaution against the spread of the coronavirus, hold up their right hands as they recite the national anthem, in Havana, Cuba, 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/Ramon Espinosa)

March 13, 2020