A man wears a face mask as he walks along a street in Beijing, Friday, February 14, 2020. (Photo by Mark Schiefelbein/AP Photo)





A couple carry a supply of toilet paper at a street on Valentine's Day in Hong Kong, Friday, February 14, 2020. (Photo by Kin Cheung/AP Photo)





In this Friday, February 14, 2020 photo, factory workers are separated by partitions as a precaution against infection as they take their lunch break on the roof of an electronics factory in Suining in southwestern China's Sichuan Province. China reported Saturday a figure of 2,641 new virus cases, a major drop from the higher numbers in recent days since a broader diagnostic method was implemented. (Photo by Chinatopix via AP Photo)





Travelers wear face masks as they walk outside the Beijing Railway Station in Beijing, Saturday, February 15, 2020. People returning to Beijing will now have to isolate themselves either at home or in a concentrated area for medical observation, said a notice from the Chinese capital's prevention and control work group published by state media late Friday. (Photo by Mark Schiefelbein/AP Photo)





Policemen wear face masks as they march in formation outside the Beijing Railway Station in Beijing, Saturday, February 15, 2020. (Photo by Mark Schiefelbein/AP Photo)





Travelers wear face masks and goggles as they use their smartphones outside the Beijing Railway Station in Beijing, Saturday, February 15, 2020. (Photo by Mark Schiefelbein/AP Photo)





A worker wearing a protective suit helps a patient carry their luggage as they arrive at a tumor hospital newly designated to treat COVID-19 patients in Wuhan in central China's Hubei Province, Saturday, February 15, 2020. The virus is thought to have infected more than 67,000 people globally and has killed at least 1,526 people, the vast majority in China, as the Chinese government announced new anti-disease measures while businesses reopen following sweeping controls that have idled much of the economy. (Photo by Chinatopix via AP Photo)





A goverment worker wearing a face mask waits for patients to arrive at a tumor hospital newly designated to treat COVID-19 patients in Wuhan in central China's Hubei Province, Saturday, February 15, 2020. (Photo by Chinatopix via AP Photo)





A woman wearing a protective face mask receives a temperature check from a security guard as she enters Qianmen Street, a popular tourist spot, in Beijing, Sunday, February 16, 2020. China reported Sunday a drop in new virus cases for the third straight day, as it became apparent that the country's leadership was aware of the potential gravity of the situation well before the alarm was sounded. (Photo by Andy Wong/AP Photo)





A security guard wearing a protective face mask stands near barricades placed at a quiet main Qianmen Street, a popular tourist spot, in Beijing, Sunday, February 16, 2020. (Photo by Andy Wong/AP Photo)





Masked workers jump a rope at a quiet main Qianmen Street, a popular tourist spot, in Beijing, Sunday, February 16, 2020. (Photo by Andy Wong/AP Photo)





A woman wearing a face mask walks in front of flags of China, right, and Hong Kong, in Hong Kong Sunday, February 16, 2020. COVID-19 viral illness has sickened tens of thousands of people in China since December. (Photo by Vincent Yu/AP Photo)





A masked security guard takes a nap next to a closed shop following a COVID-19 virus outbreak, at a quiet main Qianmen Street, a popular tourist spot, in Beijing, Sunday, February 16, 2020. China reported Sunday a drop in new virus cases for the third straight day, as it became apparent that the country's leadership was aware of the potential gravity of the situation well before the alarm was sounded. (Photo by Andy Wong/AP Photo)





In this Sunday, February 16, 2020, photo, medical workers wearing full protective suits chat to each other at a hospital in Wuhan in central China's Hubei province. Chinese authorities on Monday reported a slight upturn in new virus cases and hundred more deaths for a total of thousands since the outbreak began two months ago. (Photo by Chinatopix via AP Photo)





A woman wearing masks, stretches her arms in Hong Kong, Wednesday, February 19, 2020. Russia says it will temporarily ban Chinese nationals from entering the country amid the outbreak of the new virus centered in China that has infected more than 73,000 people. (Photo by Kin Cheung/AP Photo)





A biker wearing a mask passed by a closed intersection in Fuyang, Anhui Province, China. On February 13, COVID-19 coronavirus killed more than 1,300 people in China and infected more than 59,000 people. (Photo by Sheldon Cooper/SOPA Images/SIPA Press)





People wearing face masks stand on an elevator next to an advertisement of a recruitment platform Boss Zhipin, inside the Xierqi subway station, on the morning after the extended Lunar New Year holiday caused by the novel coronavirus outbreak, in Beijing, China February 10, 2020. (Photo by Tingshu Wang/Reuters)





In this Tuesday, February 18, 2020, photo, a delivery worker for Chinese e-commerce giant JD.com leaves with the morning load of parcels from a distribution center in Beijing, China. JD and rivals including Pinduoduo, Miss Fresh and Alibaba Group's Hema are scrambling to fill a boom in orders while protecting their employees. E-commerce is one of the few industries to thrive after anti-virus controls starting in late January closed factories, restaurants, cinemas, offices and shops nationwide and extinguished auto and real estate sales. (Photo by Ng Han Guan/AP Photo)





Manager Chen Tiantian wears a face mask as she waits for customers to place an order at a Moka Bros cafe in Beijing, Friday, February 14, 2020. For Valentine's Day Moka Bros, a health food eatery in Beijing, offered a special that included both a rose and a note logging the temperature of the chef that made the meal. Like many businesses in China, the restaurant has struggled to cope with the impact of a virus that has infected tens of thousands of people worldwide and sent several cities into lockdown. (Photo by Mark Schiefelbein/AP Photo)





Medical personnel checks people body temperature at a roadblock in Guangzhou, China, 13 February 2020. On 12 February Hubei province recorded the largest single-day spike in coronavirus-related deaths, with 242 victims and 14,840 people diagnosed with Covid-19. The disease caused by the SARS-CoV-2 has been officially named Covid-19 by the World Health Organization (WHO). The outbreak, which originated in the Chinese city of Wuhan, has so far killed at least 1,369 people with over 60,000 infected worldwide, mostly in China. (Photo by Alex Plavevski/EPA/EFE)