• TOPSHOT - People wear masks as they pray at Wong Tai Sin temple on the first day of the Lunar New Year of the Rat in Hong Kong on January 25, 2020, as a preventative measure following a coronavirus outbreak which began in the Chinese city of Wuhan. - Hong Kong on January 25 declared a mystery virus outbreak as an "emergency" -- the city's highest warning tier -- as authorities ramped up measures aimed at reducing the risk of further infections spreading. (Photo by DALE DE LA REY / AFP) (Photo by DALE DE LA REY/AFP via Getty Images)