Customers shop in front of a half-empty freezer for diary products, following the coronavirus disease (COVID-19) outbreak, at a supermarket in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Customers buy instant noodles, following the coronavirus disease (COVID-19) outbreak, at a supermarket in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Customers wearing face masks shop at the vegetables section of a supermarket following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

Customers wearing face masks shop at the vegetables section of a supermarket following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

People wearing protective masks buy vegetables from stalls that displayed outside a shop, following the coronavirus disease (COVID-19) outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

A staff member takes notes of goods at a half empty freezer for fruits, following the coronavirus disease (COVID-19) outbreak, at a supermarket in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

A medical worker in protective suit takes swab samples from a resident at a makeshift nucleic acid testing site, during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Medical workers in protective suits take swab samples from residents at a makeshift nucleic acid testing site, during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang REFILE-QUALITY REPEAT 

A medical worker in protective suit takes swab samples from a resident at a makeshift nucleic acid testing site, during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang REFILE-QUALITY REPEAT 

Residents line up at a makeshift nucleic acid testing site during a mass testing for the coronavirus disease (COVID-19) following the outbreak, in Beijing, China April 25, 2022. REUTERS/Tingshu Wang REFILE-QUALITY REPEAT 

A man wearing a face mask walks next to medical workers wearing protective suits as he lines up to take nucleic acid test at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A woman takes nucleic acid test at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

People wearing face masks walk next to medical workers wearing protective suits as they line up to take nucleic acid tests at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A medical worker wearing protective suit takes swab sample of a man at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A medical worker wearing protective suit takes swab sample of a woman at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

Residents wearing face masks line up to get food supplies from a grocery store following the coronavirus disease (COVID-19) outbreak in Chaoyang district of Beijing, China April 25, 2022. REUTERS/Xiaoyu Yin 

A woman takes nucleic acid test at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A worker in a protective suit walks next to people lining up to take nucleic acid tests at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A man takes nucleic acid test at a mobile testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China, April 25, 2022. REUTERS/Carlos Garcia Rawlins 

A worker in a protective suit walks next to people lining up to take nucleic acid tests at a makeshift testing site following the coronavirus disease (COVID-19) outbreak in Beijing, China April 25, 2022. REUTERS/Carlos Garcia Rawlins