Tokyo 2020 Olympics - Beach Volleyball - Women - Pool D - USA (Claes/Sponcil) v Latvia (Graudina/Kravcenoka) - Shiokaze Park, Tokyo, Japan - July 26, 2021. A member of staff wearing a face mask prepares the sand field during a break in the match. REUTERS/John Sibley

Tokyo 2020 Olympics - Volleyball - Men's Pool A - Iran v Venezuela - Ariake Arena, Tokyo, Japan – July 26, 2021. Team members wearing face masks line up before the match. REUTERS/Carlos Garcia Rawlins

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks commute aboard a train on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

People wearing protective face masks walk along a platform on the London Underground, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

A person wearing a poncho and protective face mask walks through heavy rainfall, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, July 25, 2021. REUTERS/Henry Nicholls

A taxi driver wearing white gloves and a face mask is seen through a plastic separator, amid the coronavirus disease (COVID-19) outbreak, as he drives back from the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Local residents in face masks, amid the coronavirus disease (COVID-19) outbreak, walking along an almost empty street are seen through the window of a special bus transporting journalists to the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Tokyo 2020 Olympics - Hockey - Men's Pool B - South Africa v Netherlands - Oi Hockey Stadium, Tokyo, Japan - July 25, 2021. A woman wearing a face mask looks on inside the stadium. REUTERS/Siphiwe Sibeko

A Japanese family wearing face masks, amid the coronavirus disease (COVID-19) outbreak, is seen through the window of a special bus transporting journalists to the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Local residents in face masks, amid the coronavirus disease (COVID-19) outbreak, walking along during a rush hour are seen through the window of a special bus transporting journalists to the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Local residents in face masks, amid the coronavirus disease (COVID-19) outbreak, walking along during a rush hour are seen through the window of a special bus transporting journalists to the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Local residents in face masks, amid the coronavirus disease (COVID-19) outbreak, walking along during a rush hour are seen through the window of a special bus transporting journalists to the Miyagi Stadium during of the Tokyo 2020 Olympic Games in Sendai, the capital city of Miyagi, Japan, July 25, 2021. REUTERS/Amr Abdallah Dalsh

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Beam - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Nina Derwael of Belgium is seen in a face mask as she hugs teammates after their competition REUTERS/Mike Blake

Tokyo 2020 Olympics - Volleyball - Women's Pool A - Japan v Kenya - Ariake Arena, Tokyo, Japan – July 25, 2021. Staff member wearing a protective face mask disinfects the net. REUTERS/Valentyn Ogirenko

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Team - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Judges wearing protective face mask look at gymnasts during competition. REUTERS/Dylan Martinez

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Vault - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Maellyse Brassart of Belgium, Jutta Verkest of Belgium, Nina Derwael of Belgium and Lisa Vaelen of Belgium are seen in face masks as they wait to compete REUTERS/Mike Blake

Tokyo 2020 Olympics - Judo - Men's 66kg - Medal Ceremony - Nippon Budokan - Tokyo, Japan - July 25, 2021. Staff member holds placards requesting that people put on their protective face masks REUTERS/Hannah Mckay

Tokyo 2020 Olympics - Soccer Football - Men - Group A - Japan v Mexico - Saitama Stadium, Saitama, Japan - July 25, 2021. Japan coach Hajime Moriyasu wearing a protective face mask before the match REUTERS/Molly Darlington

Tokyo 2020 Olympics - Soccer Football - Men - Group A - Japan v Mexico - Saitama Stadium, Saitama, Japan - July 25, 2021. Mexico coach Jaime Lozano wearing a protective face mask before the match REUTERS/Molly Darlington

Tokyo 2020 Olympics - Volleyball - Women's Pool A - Japan v Kenya - Ariake Arena, Tokyo, Japan – July 25, 2021. Team members wearing protective face masks line up before the match. REUTERS/Carlos Garcia Rawlins

Children wearing protective face masks look through the fence of Aomi Urban Sports Park, where 3x3 basketball tournaments are held, during Tokyo 2020 Olympic Games in Tokyo, Japan July 25, 2021. REUTERS/Issei Kato

A woman wearing a protective face mask walks on an Olympics decoration with a message reading "We are a team, whether we are far away or wherever we are" during Tokyo 2020 Olympic Games in Tokyo, Japan July 25, 2021. REUTERS/Issei Kato TPX IMAGES OF THE DAY

Tokyo 2020 Olympics - Hockey - Men's Pool A - India v Australia - Oi Hockey Stadium, Tokyo, Japan - July 25, 2021. A member of the staff, wearing a face mask, looks on. REUTERS/Bernadett Szabo

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Match official wearing a protective face mask holds the added time board aloft REUTERS/Phil Noble

Tokyo 2020 Olympics - Hockey - Men's Pool A - India v Australia - Oi Hockey Stadium, Tokyo, Japan - July 25, 2021. A member of the staff, wearing a face mask, looks on. REUTERS/Bernadett Szabo

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Eric Bailly of Ivory Coast splashes water over his face during the match REUTERS/Phil Noble

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Eric Bailly of Ivory Coast splashes water over his face during the match REUTERS/Phil Noble

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Cheick Timite of Ivory Coast is ushered on to the pitch by a match official wearing a protective face mask REUTERS/Phil Noble

Tokyo 2020 Olympics - Basketball - Men - Group B - Australia v Nigeria - Saitama Super Arena, Saitama, Japan - July 25, 2021. Referee Takaki Kato wearing a protective face mask REUTERS/Brian Snyder

Tokyo 2020 Olympics - Fencing - Women's Individual Foil - Semifinal - Makuhari Messe Hall B - Chiba, Japan - July 25, 2021. Lee Kiefer of the United States wears a protective face mask before the match REUTERS/Annegret Hilse

Tokyo 2020 Olympics - Fencing - Women's Individual Foil - Semifinal - Makuhari Messe Hall B - Chiba, Japan - July 25, 2021. Inna Deriglazova of the Russian Olympic Committee wipes her face with a towel REUTERS/Maxim Shemetov

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Individual All-Around - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Alba Petisco of Spain and Laura Bechdeju of Spain wearing protective face masks look on. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Bruno Guimaraes of Brazil splashes water over his face REUTERS/Phil Noble

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Drops of water are seen coming from the face of Bruno Guimaraes of Brazil after he poured water over his head REUTERS/Phil Noble

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Individual All-Around - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Alba Petisco of Spain wearing a protective face mask reacts. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Team - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Women's team of Spain wearing protective face masks looks on. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Soccer Football - Men - Group A - France v South Africa - Saitama Stadium, Saitama, Japan - July 25, 2021. General view of a member of staff wearing a protective face mask sat in the stand surrounded by empty seats during the match REUTERS/Molly Darlington

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Individual All-Around - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Simone Biles of the United States wearing a protective face mask looks down. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Soccer Football - Men - Group A - France v South Africa - Saitama Stadium, Saitama, Japan - July 25, 2021. South Africa coach Kwanele Kopo wearing a protective face mask before the match with the Olympic rings seen in the background REUTERS/Molly Darlington

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Individual All-Around - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Simone Biles of the United States wearing a protective face mask gestures. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Individual All-Around - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Simone Biles of the United States wearing a protective face mask looks down. REUTERS/Lindsey Wasson

Tokyo 2020 Olympics - Table Tennis - Men's Singles - Round 2 - Tokyo Metropolitan Gymnasium - Tokyo, Japan - July 25, 2021. A man wearing a protective face mask watches the match REUTERS/Luisa Gonzalez TPX IMAGES OF THE DAY

Tokyo 2020 Olympics - Soccer Football - Men - Group B - New Zealand v Honduras - Ibaraki Kashima Stadium, Ibaraki, Japan - July 25, 2021. Spectators wearing protective face masks are seen inside the stadium before the match REUTERS/Henry Romero

Tokyo 2020 Olympics - Soccer Football - Men - Group D - Brazil v Ivory Coast - International Stadium Yokohama, Yokohama, Japan - July 25, 2021. Volunteer ball retriever wearing a protective face mask sat in the stand surrounded by empty seats before the match REUTERS/Phil Noble

Tokyo 2020 Olympics - Judo - Men's 66kg - Semifinal - Nippon Budokan - Tokyo, Japan - July 25, 2021. Spectator wearing a protective face mask holds Georgian flag REUTERS/Hannah Mckay

Visitors wearing face protective masks walk on Main Street at Disneyland Park in Anaheim, California, U.S., July 24, 2021. Picture taken July 24, 2021. REUTERS/Mario Anzuoni

Tokyo 2020 Olympics - Volleyball - Women's Pool B - China v Turkey - Ariake Arena, Tokyo, Japan – July 25, 2021. Team members wearing face masks line up before the match. REUTERS/Carlos Garcia Rawlins

Tokyo 2020 Olympics - Soccer Football - Men - Group B - New Zealand v Honduras - Ibaraki Kashima Stadium, Ibaraki, Japan - July 25, 2021. Spectators wearing protective face masks are seen inside the stadium before the match REUTERS/Henry Romero

Tokyo 2020 Olympics - Soccer Football - Men - Group B - New Zealand v Honduras - Ibaraki Kashima Stadium, Ibaraki, Japan - July 25, 2021. Spectators wearing protective face masks are seen inside the stadium before the match REUTERS/Henry Romero

Members of the military wearing face masks walk past a woman taking a nap in a hammock during the Tokyo 2020 Olympic Games at the Oi Hockey Stadium in Tokyo, Japan, July 25, 2021. REUTERS/Siphiwe Sibeko

Tokyo 2020 Olympics - Gymnastics - Artistic - Women's Floor Exercise - Qualification - Ariake Gymnastics Centre, Tokyo, Japan - July 25, 2021. Simone Biles of the United States is seen with a face mask before the floor exercise REUTERS/Mike Blake

Tokyo 2020 Olympics - Volleyball - Women's Pool A - Serbia v Dominican Republic - Ariake Arena, Tokyo, Japan – July 25, 2021. Bianka Busa of Serbia wearing a protective face mask during an interval. REUTERS/Valentyn Ogirenko

Tokyo 2020 Olympics - Archery Training - Yumenoshima Archery Field, Tokyo, Japan - July 25, 2021 Mackenzie Brown of the United States wears a protective face mask REUTERS/Clodagh Kilcoyne

Tokyo 2020 Olympics - Archery Training - Yumenoshima Archery Field, Tokyo, Japan - July 25, 2021 Brady Ellison of the United States wears a protective face mask REUTERS/Clodagh Kilcoyne

Tokyo 2020 Olympics - Volleyball - Women's Pool A - Serbia v Dominican Republic - Ariake Arena, Tokyo, Japan – July 25, 2021. Team members wearing face masks line up before the match. REUTERS/Carlos Garcia Rawlins