British Prime Minister Boris Johnson gives a press conference about the ongoing situation with the COVID-19 coronavirus outbreak inside 10 Downing Street in London, Tuesday, March 17, 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/Matt Dunham, Pool), APTOPIX