A worker measures body temperature of people leaving a supermarket in Qingshan district following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 7, 2020. Picture taken February 7, 2020. China Daily via REUTERS.

A customer pushes a cart while shopping inside a supermarket of Alibaba's Hema Fresh chain, following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 11, 2020.

Medical workers in protective suits attend to patients at the Wuhan International Conference and Exhibition Center, which has been converted into a makeshift hospital to receive patients with mild symptoms caused by the novel coronavirus, in Wuhan, Hubei province, China February 5, 2020. Picture taken February 5, 2020. China Daily via REUTERS.

Medical workers in protective suits attend to novel coronavirus patients at the intensive care unit (ICU) of a designated hospital in Wuhan, Hubei province, China February 6, 2020. Picture taken February 6, 2020. China Daily via REUTERS.

A makeshift memorial for Li Wenliang, a doctor who issued an early warning about the coronavirus outbreak before it was officially recognized, is seen after Li died of the virus, at an entrance to the Central Hospital of Wuhan in Hubei province, China February 7, 2020.

A nurse in a protective suit feeds a novel coronavirus patient inside an isolated ward at Zhongnan Hospital of Wuhan University, during the Lantern Festival, which marks the end of the Chinese Lunar New Year celebrations, in Wuhan, Hubei province, China February 8, 2020. China Daily via REUTERS.

A man wearing a face mask shops for vegetables inside a fresh food store following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 8, 2020. Picture taken February 8, 2020. cnsphoto via REUTERS.

Customers wearing face masks shop inside a supermarket following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 10, 2020. China Daily via REUTERS.

A delivery worker for Alibaba's Hema Fresh chain rides his electric bicycle on a road following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 7, 2020.

Coronavirus patients and medical staff dance to a lively Chinese song about red flowers at a makeshift hospital in Wuhan, China in this still frame obtained from video dated February 10, 2020. China News Service via REUTERS TV.

Cars travel next to closed shops following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 7, 2020.

Filipinos, voluntarily evacuated due to the coronavirus outbreak, board a plane from Wuhan, Hubei, China, February 9, 2020. Courtesy of Department of Foreign Affairs/Handout via REUTERS.

A worker takes body temperature measurement of a man at the entrance to a residential compound following an outbreak of the new coronavirus in Wuhan, Hubei province, China February 1, 2020. Picture taken February 1, 2020. China Daily via REUTERS. Image used for illustrative purpose.

A medical worker in protective suit is seen at an isolated ward of a hospital in Caidian district following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 6, 2020. Picture taken February 6, 2020. China Daily via REUTERS.

A worker in protective suit serves customers at a checkout counter of a supermarket following the outbreak of the novel coronavirus in Wuhan, Hubei province, China February 12, 2020. China Daily via REUTERS.

Workers in protective suits examine specimens inside a laboratory following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 6, 2020. Picture taken February 6, 2020. China Daily via REUTERS.

A security officer suited in protective gear checks passports of passengers boarding a cargo plane, chartered by the U.S. State Department to evacuate Americans and Canadians from China due to the outbreak of novel Coronavirus, at Wuhan Tianhe International Airport in Wuhan, China February 7, 2020. Picture taken February 7, 2020. Courtesy of Edward Wang via REUTERS.

Medical workers in protective suits move a patient at an isolated ward of a hospital in Caidian district following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 6, 2020. Picture taken February 6, 2020. China Daily via REUTERS.

Community volunteers deliver donated vegetables to elderly residents at Furen community on the Lantern Festival, which marks the end of the Chinese Lunar New Year celebrations, following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 8, 2020. Picture taken February 8, 2020. cnsphoto via REUTERS.

Staff from the U.S. embassy assemble before inspecting a cargo plane, chartered by the U.S. State Department to evacuate Americans and Canadians from China due to the outbreak of novel Coronavirus, at Wuhan Tianhe International Airport in Wuhan, China February 7, 2020. Picture taken February 7, 2020. Courtesy of Edward Wang via REUTERS.

Community workers distribute free vegetables to members of households inside the residential compound, following the outbreak of the novel coronavirus in Wuhan, Hubei province, China February 11, 2020. China Daily via REUTERS.

A worker is seen inside a convenience store following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 11, 2020.

A medical worker in protective suit moves a novel coronavirus patient in a wheelchair at a hospital in Wuhan, Hubei province, China February 10, 2020. Picture taken February 10, 2020. China Daily via REUTERS.

Cleaning workers wear face masks outside a closed shop following an outbreak of the novel coronavirus in Wuhan, Hubei province, China February 7, 2020.

Medical workers in protective suits are seen at the Wuhan Parlor Convention Center, which has been converted into a makeshift hospital following an outbreak of the novel coronavirus, in Wuhan, Hubei province, China February 7, 2020. Picture taken February 7, 2020. cnsphoto via REUTERS.

Workers set up medical equipment at the new Leishenshan Hospital, a makeshift hospital for treating patients of the new coronavirus that is under construction, in Wuhan, Hubei province, China February 5, 2020. Picture taken February 5, 2020. cnsphoto via REUTERS.

Workers set up beds at the Wuhan Parlor Convention Center to convert it into a makeshift hospital following an outbreak of the new coronavirus, in Wuhan, Hubei province, China February 4, 2020. China Daily via REUTERS.