A worker helps convert the National Exhibition and Convention Center into a makeshift hospital for the coronavirus disease, in Shanghai, China, April 7, 2022.

Staff in personal protective equipment (PPE) work by a barrier of an area under lockdown amid the COVID-19 pandemic, in Shanghai, China, March 26, 2022.

A woman leans on a barrier sealing off an area under lockdown, following the COVID-19 outbreak in Shanghai, China, March 28, 2022.

A worker in a protective suit walks at an entrance to a tunnel leading to the Pudong area across the Huangpu river, after restrictions on highway traffic amid the lockdown to contain the spread of COVID-19 in Shanghai, China, March 28, 2022.

Police officers in protective suits keep watch at an entrance to a tunnel leading to the Pudong area across the Huangpu river, after traffic restrictions amid the lockdown to contain the spread of the coronavirus disease (COVID-19) in Shanghai, China, March 28, 2022.

A security guard in personal protective equipment (PPE) walks at a main shopping area following the COVID-19 outbreak in Shanghai, China, March 29, 2022.

An aerial view shows highways and buildings amid a lockdown to contain the spread of COVID-19 in Shanghai, China, March 30, 2022.

A security guard in a protective suit stands near an exit of a tunnel leading to the Pudong area, across the Huangpu river, amid the lockdown and restrictions on highway traffic to contain the spread of COVID-19, in Shanghai, China, March 28, 2022.

Two little girls wearing face masks, play with their bikes, following the COVID-19 outbreak in Shanghai, China, March 29, 2022.

Police officers in protective suits operate a drone with a loudspeaker reminding residents to follow epidemic preventive measures, following the COVID-19 outbreak in Shanghai, China, March 30, 2022.

An aerial view shows a bridge over the Huangpu river, amid traffic restrictions and a lockdown in the Pudong area to contain the spread of COVID-19 in Shanghai, China, March 29, 2022.

Workers in protective suits keep watch at a sealed-off area following the COVID-19 outbreak in Shanghai, China, March 30, 2022.

A security guard wearing protective gear sets up barriers from inside a sealed-off area, before the second stage of a two-stage lockdown to curb the spread of the coronavirus disease (COVID-19), in Shanghai, China, March 31, 2022.

A man uses a mobile phone while leaning on a scooter in front of barricades of a sealed-off area, following the COVID-19 outbreak in Shanghai, China, March 30, 2022.

Bags of vegetables are seen at a residential compound before the second stage of a two-stage lockdown to curb the spread of COVID-19, in Shanghai, China, March 31, 2022.

A worker carries a plank as he sets up barriers to seal off the area before the second stage of a two-stage lockdown to curb the spread of COVID-19, in Shanghai, China, March 31, 2022.

Residents line up for nucleic acid testing at a residential area, during the second stage of a two-stage lockdown to curb the spread of COVID-19, in Shanghai, China, April 4, 2022.

Health workers wearing personal protective equipment (PPE) stand next to the entrance of a neighborhood during a COVID-19 lockdown in the Jing'an district in Shanghai, April 12, 2022.

Residents line up for nucleic acid testing at a residential area, during the second stage of a two-stage lockdown to curb the spread of COVID-19 in Shanghai, China, April 4, 2022.

Workers in protective suits spray disinfectant during the lockdown to curb the spread of COVID-19 in Shanghai, China, April 5, 2022.

A man standing on a scooter scans a QR code to buy food from a vendor behind barricades of a sealed-off area, following the COVID-19 outbreak in Shanghai, China, March 30, 2022.

A person in a protective suit walks a dog in a residential area under lockdown, amid the COVID-19 pandemic, in Shanghai, China, April 5, 2022.

A man helps a woman to consume a packet of traditional Chinese medicine (TCM) Lianhua Qingwen, as she sits by the side of a road outside a residential compound, during a lockdown to curb the spread of COVID-19 in Shanghai, China, April 5, 2022.

A worker in a protective suit sprays disinfectant at a community, during the lockdown to curb the spread of COVID-19 in Shanghai, China, April 5, 2022.

Workers convert the National Exhibition and Convention Center into a makeshift hospital for COVID-19, in Shanghai, China, April 7, 2022.

A worker in a protective suit keeps watch next to barricades set around a sealed-off area, during a lockdown to curb the spread of COVID-19 in Shanghai, China, April 11, 2022.

Medical workers in protective suits check a child patient as they conduct ward rounds at Shanghai New International Exhibition Hall, which has been turned into a makeshift hospital for COVID-19 in Shanghai, China, April 9, 2022.

A person in a protective suit looks over barricades set around a sealed-off area, during a lockdown to curb the spread of COVID-19 in Shanghai, China, April 11, 2022.

A boy who was quarantined in his home for 12 days and came out for a COVID-19 test walks under the cherry blossom trees in a residential community under lockdown in Shanghai, China, April 12, 2022.

People ride bicycles on a street during a COVID-19 lockdown in the Jing'an district in Shanghai, April 12, 2022.

Medical personnel in protective gear wait for people to come for COVID-19 testing in a residential community under lockdown in Shanghai, China, April 12, 2022.

A man gets tested for COVID-19 at a makeshift nucleic acid testing site behind barriers of an area under lockdown amid the COVID-19 pandemic, in Shanghai, China, March 26, 2022.

Workers make beds at a 17-story office building to convert it into a makeshift hospital for COVID-19, in Shanghai, China, April 12, 2022.

People line up for COVID-19 testing in a residential community under lockdown in Shanghai, China, April 12, 2022.

A toy is seen on a windowsill during the second stage of a two-stage lockdown to curb the spread of COVID-19, in Shanghai, China, April 4, 2022.

A community volunteer wearing personal protective equipment counts vegetables to be distributed by the local government to residents in a compound during a COVID-19 lockdown in Pudong district in Shanghai, April 12, 2022.

Police officers and staff workers get tested for COVID-19 at a makeshift nucleic acid testing center inside barriers of an area under lockdown amid the coronavirus disease pandemic, in Shanghai, China, March 24, 2022.

People pass food to residents over the barriers of an area under lockdown, amid the COVID-19 pandemic, in Shanghai, China, March 25, 2022.