A woman walks in a deserted shopping street in Jiujiang, Jiangxi province, China, on February 1, 2020. #

An aerial view of roads and bridges in Wuhan, Hubei province, on February 3, 2020 #

A man crosses an empty highway on February 3, 2020, in Wuhan. #

A Chinese man wears a protective mask as he rides an escalator in an empty shopping mall in Beijing's Central Business District on February 3, 2020. #

A Chinese woman wears a protective mask as she rides in a nearly empty subway car during the evening rush hour on February 3, 2020, in Beijing. #

A man wearing a mask walks in Lujiazui financial district in Pudong, Shanghai, China, on February 3, 2020. #

A mother and her son arrive from Hubei province at a checkpoint on the Jiujiang Yangtze River Bridge in Jiujiang, Jiangxi province, on January 31, 2020. #

Police stand at a checkpoint on the Jiujiang Yangtze River Bridge, which connects to Hubei province, in Jiujiang, on January 31, 2020. #

Field sprayers work to disinfect areas in Zouping City, Shandong Province, on January 29, 2020. #

A government worker disinfects a co-worker after visiting a woman in home quarantine in Qingdao in eastern China's Shandong province on February 3, 2020. #

An aerial view of the construction site of Huoshenshan Hospital in Wuhan, in central China's Hubei province, on February 2, 2020 #

A new CT scanner sits in a room in Huoshenshan Hospital in Wuhan on February 2, 2020. #

Laborers continue to work on Wuhan's Huoshenshan Hospital on February 2, 2020. #

Citizens wear masks to protect against viruses on February 4, 2020, in Guangzhou, China. #

Medical workers spray antiseptic outside of the main gate of the Shanghai Stock Exchange Building on February 3, 2020 in Shanghai, China. #

A woman wearing a face mask takes a photo of a child in a nearly empty Tiananmen Square in Beijing on February 4, 2020. #

A woman wearing a mask checks her cellphone in Shanghai, China, on January 29, 2020. #

A dog wears a paper cup over its snout on a street in Beijing on February 4, 2020. #

People wearing masks walk through an empty shopping area in Shanghai on February 4, 2020. #

A government worker checks the temperature of a woman in home quarantine in Qingdao on February 3, 2020. #

Obstacles are set up to drive visitors toward manned entry points where people's body temperature can be monitored, on a street in Guangzhou, on February 3, 2020. #

Members of a neighborhood committee register a local and ask about his travel history in Jiujiang, Jiangxi province, on February 2, 2020. #

A customer walks in a supermarket in Wuhan on January 29, 2020, in this picture obtained from social media. #

A delivery man drives down an empty street as he carries packages on February 1, 2020, in Wuhan. #