In this Friday, January 31, 2020, photo released by China's Xinhua News Agency, people wearing face masks walk past buildings lit up with slogans of encouragement in Wuhan in central China's Hubei Province. The United States on Friday declared a public health emergency and took drastic steps to significantly restrict entry into the country because of a new virus that hit China and has spread to other nations. (Photo by Xiao Yijiu/Xinhua via AP Photo)
