Nursing home workers take a seat after receiving the first dose of the AstraZeneca Covid-19 vaccine at a health care centre in Seoul on February 26, 2021, as South Korea starts coronavirus vaccination campaign. Jung Yeon-je/Pool via REUTERS

Katherine C. Tai takes her seat for the Senate Finance committee hearings to examine her nomination to be United States Trade Representative, with the rank of Ambassador, in Washington, DC February 25, 2021. Bill O'Leary/Pool via REUTERS

The seat for McDonald’s Corporation President and Chief Executive Officer Chris Kempczinski is empty during a Senate Budget Committee hearing examining wages at large profitable corporations on Capitol Hill in Washington, U.S. February 25, 2021. Susan Walsh/Pool via REUTERS

The seat for Walmart President and Chief Executive Officer Doug McMillon is empty during a Senate Budget Committee hearing examining wages at large profitable corporations on Capitol Hill in Washington, U.S. February 25, 2021. Susan Walsh/Pool via REUTERS

Vivek Murthy, nominated to be Medical Director in the Regular Corps of the Public Health Service, and to be Surgeon General of the Public Health Service, is seated to testify during a Senate Health, Education, Labor, and Pensions Committee hearing on Capitol Hill in Washington, U.S., February 24, 2021. REUTERS/Tom Brenner/Pool

Nurse Zenub Mahood sanitises a seat at Bradford Central Mosque, amid the coronavirus disease (COVID-19) outbreak in Bradford, Britain, February 25, 2021. REUTERS/Jason Cairnduff

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

Syrian migrant Tareq Alaows, who is running for the Greens party in the western state of North Rhine-Westphalia, for the September's federal general election poses during an interview with Reuters at the Reichstag building, the seat of the lower house of parliament Bundestag, in Berlin, Germany, February 3, 2021. Picture taken February 3, 2021. REUTERS/Fabrizio Bensch

William Burns is seated to testify before a Senate Intelligence Committee hearing on his nomination to be director of the Central Intelligence Agency (CIA) on Capitol Hill in Washington, U.S., February 24, 2021. REUTERS/Tom Brenner/Pool

Pakistan's Prime Minister Imran Khan walks back to his seat after his speech, next to his Sri Lankan counterpart Mahinda Rajapaksa, at the Trade and Investments conference during Khan's two-day visit, in Colombo, Sri Lanka February 24, 2021. REUTERS/Dinuka Liyanawatte

Classroom seats are stacked near windows ahead of in-person learning amid the coronavirus disease (COVID-19) pandemic, at the Jefferson-Houston School in Alexandria, Virginia, U.S., February 23, 2021. REUTERS/Tom Brenner

A redesigned seating configuration is seen during a Brooklyn Nets press event to demonstrate how they will reopen for fans, during coronavirus disease (COVID-19) pandemic, at the Barclays Center in the Brooklyn borough of New York City, U.S., February 22, 2021. REUTERS/Brendan McDermid

A redesigned seating configuration is seen during a Brooklyn Nets press event to demonstrate how they will reopen for fans, during coronavirus disease (COVID-19) pandemic, at the Barclays Center in the Brooklyn borough of New York City, U.S., February 22, 2021. REUTERS/Brendan McDermid

Straps are used to close off seats during a Brooklyn Nets press event to demonstrate how they will reopen for fans, during coronavirus disease (COVID-19) pandemic, at the Barclays Center in the Brooklyn borough of New York City, U.S., February 22, 2021. REUTERS/Brendan McDermid

A redesigned seating configuration is seen during a Brooklyn Nets press event to demonstrate how they will reopen for fans, during coronavirus disease (COVID-19) pandemic, at the Barclays Center in the Brooklyn borough of New York City, U.S., February 22, 2021. REUTERS/Brendan McDermid

U.S. Senator Ted Cruz (R-TX) is seated prior to a Senate Judiciary Committee hearing on the nomination of Judge Merrick Garland to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

U.S. Senator Ted Cruz (R-TX) is seated prior to a Senate Judiciary Committee hearing on the nomination of Judge Merrick Garland to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

U.S. Senator Ted Cruz (R-TX) is seated prior to a Senate Judiciary Committee hearing on the nomination of Judge Merrick Garland to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

U.S. Senator Ted Cruz (R-TX) is seated prior to a Senate Judiciary Committee hearing on the nomination of Judge Merrick Garland to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

Senate Judiciary Committee Chairman Dick Durbin (D-IL) is seated next to Sen. Chuck Grassley (R-IA) prior to presiding over a Senate Judiciary Committee hearing on the nomination of Judge Merrick Garland to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

Judge Merrick Garland is seated to testify before a Senate Judiciary Committee hearing on his nomination to be U.S. Attorney General on Capitol Hill in Washington, U.S., February 22, 2021. REUTERS/Carlos Barria/Pool

A dancer wearing a protective mask to curb the spread of the coronavirus disease (COVID-19), sits among the empty seats as she watches her colleagues during a virtual dance performance titled 'The Story of Man: In Search of A New Ideal' by Namarina Youth Dance, at the Jakarta Art Building, Indonesia, February 21, 2021. Picture taken February 21, 2021. REUTERS/Willy Kurniawan

Soccer Football - La Liga Santander - FC Barcelona v Cadiz - Camp Nou, Barcelona, Spain - February 21, 2021 General view of a cameraman amongst empty seats inside the stadium before the match REUTERS/Albert Gea

People wait seated to receive a dose of AstraZeneca coronavirus disease (COVID-19) vaccine at Municipal Gymnasium in Linares Mexico February 17, 2021. REUTERS/Daniel Becerril

People wait seated to receive a dose of AstraZeneca coronavirus disease (COVID-19) vaccine at Municipal Gymnasium in Linares Mexico February 17, 2021. REUTERS/Daniel Becerril

People wait seated to receive a dose of AstraZeneca coronavirus disease (COVID-19) vaccine at Municipal Gymnasium in Linares Mexico February 17, 2021. REUTERS/Daniel Becerril

People wait seated to receive a dose of AstraZeneca coronavirus disease (COVID-19) vaccine at Municipal Gymnasium in Linares Mexico February 17, 2021. REUTERS/Daniel Becerril

A worker cleans the seats in the stands at Sardar Patel Gujarat Stadium, where India and England are scheduled to play their third test match, in Ahmedabad India, February 17, 2021. REUTERS/Amit Dave TPX IMAGES OF THE DAY

Soccer Football - Champions League - Round of 16 First Leg - RB Leipzig v Liverpool - Puskas Arena, Budapest, Hungary - February 16, 2021 General view of empty seats before the match REUTERS/Bernadett Szabo

Soccer Football - Champions League - Round of 16 First Leg - RB Leipzig v Liverpool - Puskas Arena, Budapest, Hungary - February 16, 2021 General view of flags and empty seats before the match REUTERS/Bernadett Szabo

Soccer Football - Champions League - Round of 16 First Leg - RB Leipzig v Liverpool - Puskas Arena, Budapest, Hungary - February 16, 2021 General view of stewards standing among empty seats before the match REUTERS/Bernadett Szabo

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal reacts during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal sits down during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Australia's Alex de Minaur is in action during his third round match against Italy's Fabio Fognini. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Asanka Brendon Ratnayake

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Spain's Rafael Nadal is in action during his third round match against Britain's Cameron Norrie. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of people and empty seats during the third round. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Australia's Ashleigh Barty in action during her third round match against Russia's Ekaterina Alexandrova. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Australia's Ashleigh Barty in action during her third round match against Russia's Ekaterina Alexandrova. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Kelly Defina

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Estonia's Anett Kontaveit is in action during her third round match against Shelby Rogers of the U.S. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Estonia's Anett Kontaveit is in action during her third round match against Shelby Rogers of the U.S. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Estonia's Anett Kontaveit is in action during her third round match against Shelby Rogers of the U.S. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Shelby Rogers of the U.S. is in action during her third round match against Estonia's Anett Kontaveit. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Loren Elliott

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Russia's Ekaterina Alexandrova is in action during her third round match against Australia's Ashleigh Barty. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19)

Tennis - Australian Open - Melbourne Park, Melbourne, Australia, February 13, 2021 General view of empty seats as Czech Republic's Karolina Pliskova is in action during her third round match against Czech Republic's Karolina Muchova. The tournament continues without crowds today after the state of Victoria was placed under a snap lockdown from Friday to contain a fresh outbreak of the coronavirus disease (COVID-19) REUTERS/Jaimi Joy