Residents wearing face masks pay for noodles at a residential area blocked by barriers in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, April 3, 2020. Residents of Wuhan, epicentre of the coronavirus epidemic in China that emerged late last year, should strengthen self-protection. REUTERS/Aly Song

A driver wearing a protective suit disinfects a woman on a street in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, April 3, 2020. REUTERS/Aly Song

A vendor wearing a face mask sells a soup on a street at a residential area blocked by barriers in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, April 3, 2020. REUTERS/Aly Song

A resident pays for groceries at a residential area blocked by barriers in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, April 3, 2020. REUTERS/Aly Song

People wearing face masks and raincoats walk on a street in Wuhan, Hubei province, the epicentre of China's coronavirus disease (COVID-19) outbreak, April 3, 2020. REUTERS/Aly Song