A man wears a face mask as he walks along a pavement in Hong Kong on February 7, 2020, as a preventative measure following a virus outbreak which began in the Chinese city of Wuhan. - At least 31,000 people have been infected and more than 630 killed by the virus, which has spread to two dozen countries. (Photo by Anthony WALLACE / AFP) (Photo by ANTHONY WALLACE/AFP via Getty Images)
