Packages of frozen dumplings are displayed for sale in a freezer at the Brooklyn Dumpling Shop in Manhattan in New York City, New York, U.S., May 19, 2021. Picture taken May 19, 2021. REUTERS/Brendan McDermid

European Commission President Ursula von der Leyen, Pfizer CEO Albert Bourla and Belgium's Prime Minister Alexander De Croo watch workers moving boxes of vaccines from a freezer during a visit at the factory of U.S. pharmaceutical company Pfizer in Puurs, Belgium April 23, 2021. John Thys /Pool via REUTERS

European Commission President Ursula von der Leyen, Pfizer CEO Albert Bourla and Belgium's Prime Minister Alexander De Croo watch workers moving boxes of vaccines from a freezer during a visit at the factory of U.S. pharmaceutical company Pfizer in Puurs, Belgium April 23, 2021. John Thys /Pool via REUTERS

Mexican marine soldiers stand guard next to the freezers containing the Sputnik V coronavirus disease (COVID-19) vaccines in Xochimilco on the outskirts of Mexico City, Mexico March 3, 2021. REUTERS/Edgard Garrido

A member of the security looks at the freezers at the Biovac coronavirus disease (COVID-19) vaccine storage facility in Johannesburg, South Africa, March 2, 2021. REUTERS/Siphiwe Sibeko

An empty freezer at a Trader Joe's supermarket, low on supplies due to inclement weather, is seen in Metairie, Louisiana, U.S. February 18, 2021. REUTERS/Scott Balling

A Palestinian worker stores in a freezer coronavirus disease (COVID-19) vaccines, at a warehouse run by the ministry of health in Gaza City February February 17, 2021. REUTERS/Mohammed Salem

The Pfizer-BioNTech coronavirus disease (COVID-19) vaccine is taken out of the Ultra-Cold freezer at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., February 11, 2021. REUTERS/Hannah Beier

The Pfizer-BioNTech vaccine against the coronavirus disease (COVID-19) is taken out of the Ultra-Cold freezer at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., February 11, 2021. REUTERS/Hannah Beier

The Pfizer-BioNTech vaccine against the coronavirus disease (COVID-19) is taken out of the Ultra-Cold freezer at Skippack Pharmacy in Schwenksville, Pennsylvania, U.S., February 11, 2021. REUTERS/Hannah Beier

The screen of an ultra-low temperature freezer, where the vaccines against the coronavirus disease (COVID-19) will be stored, indicates a temperature of -75 degrees Celsius as it is seen inside a warehouse of the Ministry of Health of Colombia, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

An ultra-low temperature freezer, where the vaccines against the coronavirus disease (COVID-19) will be stored, is seen inside a warehouse of the Colombian Ministry of Health, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

Ultra-low temperature freezers, where the vaccines against the coronavirus disease (COVID-19) will be stored, are seen inside a warehouse of the Colombian Ministry of Health, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

An ultra-low temperature freezer, where the vaccines against the coronavirus disease (COVID-19) will be stored, is seen inside a warehouse of the Colombian Ministry of Health, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

An ultra-low temperature freezer, where the vaccines against the coronavirus disease (COVID-19) will be stored, is seen inside a warehouse of the Colombian Ministry of Health, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

Ultra-low temperature freezers, where the vaccines against the coronavirus disease (COVID-19) will be stored, are seen inside a warehouse of the Colombian Ministry of Health, in Bogota, Colombia January 19, 2021. REUTERS/Luisa Gonzalez

A digital display shows a negative temperature on one of the newly acquired ultra low temperature freezers inside the National Strategic Cold Store in Abuja, Nigeria January 19, 2021. REUTERS/Afolabi Sotunde

Kubura Daradara, Director Logistics and Health Commodities at the National Primary HealthCare Development Agency (NPHCDA) opens one of the newly acquired ultra low temperature freezers inside the National Strategic Cold Store in Abuja, Nigeria January 19, 2021. REUTERS/Afolabi Sotunde

A digital display shows a negative temperature on one of the newly acquired ultra low temperature freezers inside the National Strategic Cold Store in Abuja, Nigeria January 19, 2021. REUTERS/Afolabi Sotunde

Vials of the Pfizer-BioNTech COVID-19 vaccine are seen in an ultra low temperature freezer at a hospital in Gonesse, as part of the coronavirus disease vaccination campaign in France, January 15, 2021. REUTERS/Benoit Tessier

Vials of the Pfizer-BioNTech COVID-19 vaccine are seen in an ultra low temperature freezer at a hospital in Gonesse, as part of the coronavirus disease vaccination campaign in France, January 15, 2021. REUTERS/Benoit Tessier

A freezer where vials of the Pfizer-BioNTech COVID-19 vaccine are stored at an ultra low temperature is seen at a hospital in Gonesse, as part of the coronavirus disease vaccination campaign in France, January 15, 2021. REUTERS/Benoit Tessier

Vials of the Pfizer-BioNTech Covid-19 vaccine are pictured in an ultra low temperature freezer at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

Vials of the Pfizer-BioNTech Covid-19 vaccine are pictured in an ultra low temperature freezer at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

A box with vials of the Pfizer-BioNTech Covid-19 vaccines is pictured in an ultra low temperature freezer at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

Vials of the Pfizer-BioNTech Covid-19 vaccine are pictured in an ultra low temperature freezer at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

A pharmacist, wearing a protective face mask, opens an ultra low temperature freezer containing boxes with vials of the Pfizer-BioNTech Covid-19 vaccine at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

Vials of the Pfizer-BioNTech Covid-19 vaccine are seen in an ultra low temperature freezer at the hospital in Le Mans, as part of the coronavirus disease (COVID-19) vaccination campaign in France, January 14, 2021. REUTERS/Stephane Mahe

A member of a German Red Cross mobile vaccination team takes a box with the Pfizer-BioNTech COVID-19 vaccine out of a freezer as the team leaves to vaccinate employees and inhabitants of a retirement nursery in Dillenburg, Germany, January 7, 2021. REUTERS/Kai Pfaffenbach

An employee stands near freezers containing Pfizer's vaccination against the coronavirus disease (COVID-19) as he works at SLE, a unit of Teva Pharmaceuticals, near Shoham, Israel January 4, 2021. Picture taken January 4, 2021. REUTERS/Ronen Zvulun

An employee holds the handle of a freezer containing Pfizer's vaccination against the coronavirus disease (COVID-19) as he works at SLE, a unit of Teva Pharmaceuticals, near Shoham, Israel January 4, 2021. Picture taken January 4, 2021. REUTERS/Ronen Zvulun

An employee opens a freezer containing Pfizer's vaccination against the coronavirus disease (COVID-19) as he works at SLE, a unit of Teva Pharmaceuticals, near Shoham, Israel January 4, 2021. Picture taken January 4, 2021. REUTERS/Ronen Zvulun

Freezer trawlers 'Halten-bank' and 'Cap Nord' are docked at Boulogne-sur-Mer after Britain and the European Union brokered a last-minute post-Brexit trade deal, northern France, December 28, 2020. Picture taken December 28, 2020. REUTERS/Charles Platiau

Freezer trawlers 'Halten-bank' and 'Cap Nord' are seen behind the customs patrol vessel 'Jacques Oudart Fourmantin' docked at Boulogne-sur-Mer after Britain and the European Union brokered a last-minute post-Brexit trade deal, northern France, December 28, 2020. Picture taken December 28, 2020. REUTERS/Charles Platiau

A worker cleans the freezer at QFX Cinemas as they prepare to reopen from December 25 after nine months of closure, amidst the outbreak of the coronavirus disease (COVID-19), in Kathmandu, Nepal December 23, 2020. REUTERS/Navesh Chitrakar

High negative temperature freezers are pictured in a warehouse which will be used as a logistic hub for COVID-19 vaccine distribution, in the Paris' suburban city of Chanteloup-en-Brie, France December 22, 2020, a day after the European Union gives the green light for the Pfizer-BioNTech coronavirus vaccine, paving the way for vaccinations to finally start in the 27-nation bloc on December 27. Geoffroy Van Der Hasselt/Pool via REUTERS

High negative temperature freezers are pictured in a warehouse which will be used as a logistic hub for COVID-19 vaccine distribution, in the Paris' suburban city of Chanteloup-en-Brie, France December 22, 2020, a day after the European Union gives the green light for the Pfizer-BioNTech coronavirus vaccine, paving the way for vaccinations to finally start in the 27-nation bloc on December 27. Geoffroy Van Der Hasselt/Pool via REUTERS

High negative temperature freezers are pictured in a warehouse which will be used as a logistic hub for COVID-19 vaccine distribution, in the Paris' suburban city of Chanteloup-en-Brie, France December 22, 2020, a day after the European Union gives the green light for the Pfizer-BioNTech coronavirus vaccine, paving the way for vaccinations to finally start in the 27-nation bloc on December 27. Geoffroy Van Der Hasselt/Pool via REUTERS

High negative temperature freezers are pictured in a warehouse which will be used as a logistic hub for COVID-19 vaccine distribution, in the Paris' suburban city of Chanteloup-en-Brie, France December 22, 2020, a day after the European Union gives the green light for the Pfizer-BioNTech coronavirus vaccine, paving the way for vaccinations to finally start in the 27-nation bloc on December 27. Geoffroy Van Der Hasselt/Pool via REUTERS

A freezer container, which was set up in April in front of the main cemetery crematorium, is pictured after the numbers of COVID-19 related deaths raised, amid the coronavirus disease (COVID-19) pandemic in Hanau, Germany, December 17, 2020. REUTERS/Ralph Orlowski

A freezer container, which was set up in April in front of the main cemetery crematorium, is pictured after the numbers of COVID-19 related deaths raised, amid the coronavirus disease (COVID-19) pandemic in Hanau, Germany, December 17, 2020. REUTERS/Ralph Orlowski

A freezer container, which was set up in April in front of the main cemetery crematorium, is pictured after the numbers of COVID-19 related deaths raised, amid the coronavirus disease (COVID-19) pandemic in Hanau, Germany, December 17, 2020. REUTERS/Ralph Orlowski

A freezer container, which was set up in April in front of the main cemetery crematorium, is pictured after the numbers of COVID-19 related deaths raised, amid the coronavirus disease (COVID-19) pandemic in Hanau, Germany, December 17, 2020. REUTERS/Ralph Orlowski

A freezer container, which was set up in April in front of the main cemetery crematorium, is pictured after the numbers of COVID-19 related deaths raised, amid the coronavirus disease (COVID-19) pandemic in Hanau, Germany, December 17, 2020. REUTERS/Ralph Orlowski

William Senior (L), Pharmacy Technician at BMC, unpacks two trays comprising the first shipment of Pfizer's coronavirus disease (COVID-19) vaccine delivered to Boston Medical Center as Victor Mendoza, Certified Pharmacy Technician at BMC, gets ready to open the storage freezer, at Boston Medical Center in Boston, Massachusetts, U.S. December 14, 2020. Jessica Rinaldi/POOL via REUTERS

William Senior (L), Pharmacy Technician at BMC, unpacks two trays comprising the first shipment of Pfizer's coronavirus disease (COVID-19) vaccine delivered to Boston Medical Center as Victor Mendoza, Certified Pharmacy Technician at BMC, gets ready to open the storage freezer, at Boston Medical Center in Boston, Massachusetts, U.S. December 14, 2020. Jessica Rinaldi/POOL via REUTERS

The temperature gage on the door of a special freezer to hold the Pfizer vaccine is shown at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

The temperature gage outside a special freezer to hold the Pfizer vaccine is shown at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

The temperature gage on the door of a special freezer to hold the Pfizer vaccine is shown at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

The temperature gage outside a special freezer to hold the Pfizer vaccine is shown at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

Pharmacy supervisor Kevin Weissman opens the door of a special freezer that will hold the Pfizer vaccine at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

The temperature gage on the door of a special freezer to hold the Pfizer vaccine is shown at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

Pharmacy supervisor Kevin Weissman uses a thick glove as he opens the door of a special freezer that will hold the Pfizer vaccine at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

Pharmacy supervisor Kevin Weissman displays a special glove that is needed to handle the Pfizer vaccine when removed from a freezer unit at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

Pharmacy supervisor Kevin Weissman puts on a special glove before opening a freezer that will hold the Pfizer vaccine at LAC USC Medical Center during the outbreak of the coronavirus disease (COVID-19) in Los Angeles, California, U.S., December 10, 2020. REUTERS/Mike Blake

An employee closes the door to the freezer where turkeys and other meats are stored amid the coronavirus disease (COVID-19) outbreak in LaGrange, Indiana, Michigan, U.S., November 20, 2020. REUTERS/Emily Elconin

The freezer room where the turkey meat is stored for distribution and slicing is pictured ahead of Thanksgiving and amid the coronavirus disease (COVID-19) outbreak in LaGrange, Indiana, Michigan, U.S., November 20, 2020. REUTERS/Emily Elconin

The freezer room where the turkey meat is stored for distribution and slicing is pictured ahead of Thanksgiving and amid the coronavirus disease (COVID-19) outbreak in LaGrange, Indiana, Michigan, U.S., November 20, 2020. REUTERS/Emily Elconin TPX IMAGES OF THE DAY

Frozen turkeys are pictured in a freezer case during the coronavirus pandemic in the Manhattan borough of New York City, New York, U.S., November 19, 2020. REUTERS/Carlo Allegri

Frozen turkeys are pictured in a freezer case during the coronavirus pandemic in the Manhattan borough of New York City, New York, U.S., November 19, 2020. REUTERS/Carlo Allegri