Eric Ciotti, President of the Departmental Council of the Alpes-Maritimes and member of Parliament, wearing a protective face mask, visits a restaurant open in solidarity with students in the fight against the precariousness and social isolation of students amid the coronavirus disease (COVID-19) outbreak in Nice, France, March 5, 2021. REUTERS/Eric Gaillard

French Minister of Higher Education, Research and Innovation, Frederique Vidal, wearing a protective face mask, visits a restaurant open in solidarity with students in the fight against the precariousness and social isolation of students amid the coronavirus disease (COVID-19) outbreak in Nice, France, March 5, 2021. REUTERS/Eric Gaillard

French Minister of Higher Education, Research and Innovation, Frederique Vidal, wearing a protective face mask, visits a restaurant open in solidarity with students in the fight against the precariousness and social isolation of students amid the coronavirus disease (COVID-19) outbreak in Nice, France, March 5, 2021. REUTERS/Eric Gaillard

French Minister of Higher Education, Research and Innovation, Frederique Vidal, wearing a protective face mask, and Christian Estrosi, Mayor of Nice, visit a restaurant open in solidarity with students in the fight against the precariousness and social isolation of students amid the coronavirus disease (COVID-19) outbreak in Nice, France, March 5, 2021. REUTERS/Eric Gaillard

French Minister of Higher Education, Research and Innovation, Frederique Vidal, wearing a protective face mask, and Christian Estrosi, Mayor of Nice, visit a restaurant open in solidarity with students in the fight against the precariousness and social isolation of students amid the coronavirus disease (COVID-19) outbreak in Nice, France, March 5, 2021. REUTERS/Eric Gaillard

People, wearing protective face masks, wait to receive the AstraZeneca COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

People, wearing protective face masks, wait to receive the Pfizer-BioNTech COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

People, wearing protective face masks, wait to receive the AstraZeneca COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

People, wearing protective face masks, wait to receive the AstraZeneca COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

People, wearing protective face masks, wait to receive the AstraZeneca COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

People, wearing protective face masks, wait to receive the AstraZeneca COVID-19 vaccine at the Clinique de l'Estree - ELSAN private hospital in Stains as part of the coronavirus disease (COVID-19) vaccination campaign in France, March 5, 2021. REUTERS/Benoit Tessier

Ralph Gleis, director of the Alte Nationalgalerie (Old National Gallery) museum, wears a mask as he stands next to Edouard Manet's 'In the Conservatory' painting, in the closed exhibition hall, during a lockdown due to the coronavirus disease (COVID-19) pandemic, in Berlin, Germany, March 5, 2021. REUTERS/Fabrizio Bensch

A man wearing a protective face mask walks past a mural praising the NHS (National Health Service) amidst the continuation of the coronavirus disease (COVID-19) pandemic, London, Britain, March 5, 2021. REUTERS/Toby Melville

A man wearing a protective face mask walks past a mural praising the NHS (National Health Service) amidst the continuation of the coronavirus disease (COVID-19) pandemic, London, Britain, March 5, 2021. REUTERS/Toby Melville

A man wearing a protective face mask walks past a mural praising the NHS (National Health Service) amidst the continuation of the coronavirus disease (COVID-19) pandemic, London, Britain, March 5, 2021. REUTERS/Toby Melville

Volkswagen group CEO Herbert Diess takes off his mask to deliver a speech during a visit to the SEAT (Volkswagen group) carmaker's factory in Martorell, near Barcelona, March 5, 2021. REUTERS/Albert Gea

Spain's King Felipe takes off his face mask to deliver a speech during a visit to the SEAT (Volkswagen group) carmaker's factory in Martorell, near Barcelona, March 5, 2021. REUTERS/Albert Gea

Pope Francis adjusts a face mask as he speaks to journalists aboard the airplane heading to Iraq, Friday, March 5, 2021. Andrew Medichini/Pool via REUTERS

A woman wearing a face mask walks past a NHS themed artwork on the side of a cinema in Shoreditch, amid the coronavirus disease (COVID-19) outbreak, in London, Britain, March 5, 2021. REUTERS/John Sibley

A masked demonstrator throws an object towards Indian police during a protest after Friday prayers in Srinagar March 5, 2021. REUTERS/Danish Ismail

A man wearing a mask walks in front of a closed school as Lombardy tightens restrictions due to a surge in the number of the coronavirus disease (COVID-19) infections in the region, in Milan, Italy, March 5, 2021. REUTERS/Flavio Lo Scalzo

Medical workers and aid staff members wearing protective face masks and shields take part in a mock inoculation exercise as the local municipality prepares for coronavirus disease (COVID-19) mass vaccination campaign, at a shopping mall in Sakura, east of Tokyo, Japan, March 5, 2021. REUTERS/Issei Kato

Medical workers wearing protective face masks and shields take part in a mock inoculation exercise as the local municipality prepares for coronavirus disease (COVID-19) mass vaccination campaign, at a shopping mall in Sakura, east of Tokyo, Japan, March 5, 2021. REUTERS/Issei Kato

People wearing masks walk in the Galleria Vittorio Emanuele II as Lombardy tightens restrictions due to a surge in the number of the coronavirus disease (COVID-19) infections in the region, in Milan, Italy, March 5, 2021. REUTERS/Flavio Lo Scalzo

A man wearing a mask walks in the Duomo square as Lombardy tightens restrictions due to a surge in the number of the coronavirus disease (COVID-19) infections in the region, in Milan, Italy, March 5, 2021. REUTERS/Flavio Lo Scalzo

A woman wearing a mask walks in the Duomo square as Lombardy tightens restrictions due to a surge in the number of the coronavirus disease (COVID-19) infections in the region, in Milan, Italy, March 5, 2021. REUTERS/Flavio Lo Scalzo

A person wearing a mask stands in the Duomo square as Lombardy tightens restrictions due to a surge in the number of the coronavirus disease (COVID-19) infections in the region, in Milan, Italy, March 5, 2021. REUTERS/Flavio Lo Scalzo

Customers wear protective masks to prevent the spread of the coronavirus disease (COVID-19) while buying fish at a market in Taipei, Taiwan, March 5, 2021. REUTERS/Ann Wang

A man wearing a protective mask receives a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A healthcare worker wearing a protective mask and a face shield prepares a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A woman wearing a protective mask reacts as she receives a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A man wearing a protective mask receives a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A health care worker wearing a protective mask and a face shield prepares a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A person wearing a protective mask sits inside a car during a medical screening before receiving a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A man wearing a protective mask receives a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

A man wearing a protective mask receives a dose of China's Sinovac Biotech vaccine for the coronavirus disease (COVID-19) at a drive-thru vaccination station, during the mass vaccination program for elderly people, in Jakarta, Indonesia, March 5, 2021. REUTERS/Willy Kurniawan

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

People wearing a protective face masks wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

A woman wearing a protective face mask shows identification while in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

A woman wearing a protective face mask shows paperwork while in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

A man wearing protective face mask shows identification while in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

A woman wearing protective face mask wait in line to receive the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

Sachiko Okawa, 76, who lost her husband in the March 11, 2011 earthquake and tsunami, calls her late husband with her two grandsons Reo and Daina inside Kaze-no-Denwa (the phone of the wind), a phone booth set up for people to call their deceased loved ones, at Bell Gardia Kujira-yama, ahead of the 10th anniversary of the disaster, in Otsuchi town, Iwate Prefecture, northern Japan, February 27, 2021. "Grandpa, it's been 10 years already and I'm going to be in middle school soon," says Daina. "There's this new virus that's killing lots of people and that's why we're wearing masks. But we're all doing well." Photograph taken with remote camera. REUTERS/Issei Kato SEARCH "KATO PHONEBOOTH" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A woman and child wearing protective face masks wait in line to make an appointment for the Johnson & Johnson's coronavirus disease (COVID-19) vaccine at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

A woman wearing protective face mask walks amid the spread of the coronavirus disease (COVID-19) by a vaccination center at Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

Boys walk without protective face masks amid the spread of the coronavirus disease (COVID-19) near Yankee Stadium in the Bronx borough of New York, U.S., March 4, 2021. REUTERS/Shannon Stapleton

Texas Governor Greg Abbott issued the most sweeping rollback of coronavirus restrictions of any U.S. state on March 2, lifting a mask mandate and fully reopening most businesses starting March 10.

White House Press Secretary Jen Psaki takes her mask off during a press briefing at the White House in Washington, U.S., March 4, 2021. REUTERS/Tom Brenner

Austrian Chancellor Sebastian Kurz adjusts his protective face mask as he prepares to deliver a joint statement with Israeli Prime Minister Benjamin Netanyahu and Denmark's Prime Minister Mette Frederiksen in Jerusalem March 4, 2021. Olivier Fitoussi/Pool via REUTERS

Christian Estrosi, Mayor of Nice, wearing a protective face mask, is seen during a visit as part of the COVID-19 saliva testing at the Valrose retirement home (Ehpad - Housing Establishment for Dependent Elderly People) in Nice, amid the coronavirus disease (COVID-19) outbreak in France, March 4, 2021. REUTERS/Eric Gaillard

A woman wearing a protective mask purchases sweets at a restaurant as the coronavirus disease (COVID-19) outbreak continues in central Istanbul, Turkey March 4, 2021. REUTERS/Murad Sezer

A restaurant employee wearing a protective mask prepares sweets for a customer as the coronavirus disease (COVID-19) outbreak continues, in central Istanbul, Turkey March 4, 2021. REUTERS/Murad Sezer

Christian Estrosi, Mayor of Nice, wearing a protective face mask, is seen during a visit as part of the COVID-19 saliva testing at the Valrose retirement home (Ehpad - Housing Establishment for Dependent Elderly People) in Nice, amid the coronavirus disease (COVID-19) outbreak in France, March 4, 2021. REUTERS/Eric Gaillard

A man wearing a protective mask sits inside a bus, amid the coronavirus disease (COVID-19) outbreak, in downtown Rio de Janeiro, Brazil March 4, 2021. REUTERS/Pilar Olivares

Professor Charles-Hugo Marquette adjusts his protective face mask during a visit as part of the COVID-19 saliva testing at the Valrose retirement home (Ehpad - Housing Establishment for Dependent Elderly People) in Nice, amid the coronavirus disease (COVID-19) outbreak in France, March 4, 2021. REUTERS/Eric Gaillard