A healthcare worker wearing protective equipment holds a swab at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

Healthcare workers wearing protective equipment are seen as they wait for participants in rapid antigen testing at a drive-in testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

A healthcare worker wearing protective equipment and a woman hold a swab during rapid antigen test at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

A health care worker wearing protective equipment is seen in a container as he waits for participants in rapid antigen testing at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

A healthcare worker wearing protective equipment looks at a swab at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

A healthcare worker wearing protective equipment is seen as he waits for participants in rapid antigen testing at a drive-in testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria, November 30, 2020. REUTERS/Leonhard Foeger

A woman wearing a protective face mask walks in a park during snowfall in Sofia, Bulgaria, November 30, 2020. REUTERS/Spasiyana Sergieva

A healthcare worker wearing protective equipment is seen in a container as he waits for participants in rapid antigen testing at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria November 30, 2020. REUTERS/Leonhard Foeger

A healthcare worker wearing protective equipment is seen in a container as he waits for participants in rapid antigen testing at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria November 30, 2020. REUTERS/Leonhard Foeger

Healthcare workers wearing protective equipment are seen during a rapid antigen test at a drive in testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria November 30, 2020. REUTERS/Leonhard Foeger

A healthcare worker wearing protective equipment speaks to a participant in rapid antigen testing at a mass testing station, as the spread of the coronavirus disease (COVID-19) continues, in Vienna, Austria November 30, 2020. REUTERS/Leonhard Foeger

Moldovan President-elect Maia Sandu wearing a protective face mask walks after a news conference in Chisinau, Moldova November 30, 2020. REUTERS/Vladislav Culiomza

People wearing protective masks cross a street, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia November 30, 2020. REUTERS/Lim Huey Teng

People wearing protective masks cross a street, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia November 30, 2020. REUTERS/Lim Huey Teng

People wear protective masks as they walk, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia November 30, 2020. REUTERS/Lim Huey Teng

French police wearing protective face masks secure the area before the arrival of former French President Nicolas Sarkozy, lawyer Thierry Herzog and former French judge Gilbert Azibert to attend their trial on charges of corruption and influence peddling, at Paris courthouse, France, November 30, 2020. REUTERS/Benoit Tessier

A medical specialist assists a patient, who wears an oxygen mask outside a hospital for people infected with the coronavirus disease (COVID-19) in Kyiv, Ukraine November 24, 2020. Picture taken November 24, 2020. REUTERS/Gleb Garanich

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

Nigerian Minister of Humanitarian Affairs, Disaster Management and Social Development, Sadiya Umar Farouq, wearing a face mask, attends a ministerial press briefing in Abuja, Nigeria November 30, 2020. REUTERS/Afolabi Sotunde

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

People wearing protective face masks cross a street, in Singapore, November 30, 2020. REUTERS/Edgar Su

EU chief negotiator Michel Barnier wearing a face mask arrives for Brexit talks in London, Britain, November 30, 2020. REUTERS/Simon Dawson

Head coach of the Russian athletics team Yury Borzakovsky wearing a protective face mask attends a conference held to appoint the new president of Russia's Athletics Federation (ARAF) in Moscow, Russia November 30, 2020. REUTERS/Maxim Shemetov

Russian Sports Minister Oleg Matytsin wears a protective face mask during a conference held to appoint the new president of Russia's Athletics Federation (ARAF) in Moscow, Russia November 30, 2020. REUTERS/Maxim Shemetov

A man wearing a face mask walks past a luxury hotel following the coronavirus disease (COVID-19) outbreak in Beijing, China, November 30, 2020. REUTERS/Thomas Peter

A couple wearing mask rides on an escalator at a subway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

People wearing masks walk at a railway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

People wearing masks walk at a railway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

Women wearing masks talk at a railway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

A man wearing a mask uses his mobile phone at his kiosk at a subway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

People wearing masks walk at a railway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

A man wearing a mask checks his train at a railway station amid the coronavirus disease (COVID-19) pandemic in Seoul, South Korea, November 30, 2020. REUTERS/Kim Hong-ji

A woman wearing a face mask due to the outbreak of the coronavirus disease (COVID-19), look through binoculars at The Paramuno corridor on Monserrate hill in Bogota, Colombia November 25, 2020. Picture taken November 25, 2020. REUTERS/Luisa Gonzalez

Soccer Football - Copa Diego Maradona - Boca Juniors v Newell's Old Boys - Estadio La Bombonera, Buenos Aires, Argentina - November 29, 2020 Boca Juniors' Carlos Izquierdoz, Newell's Old Boys' Maxi Rodriguez and referees wearing a special jersey as a tribute to Diego Maradona Pool via REUTERS/Alejandro Pagni

Ethiopian refugee wears a T-shirt featuring Tigray leader Debretsion Gebremichael, at the Um Rakuba refugee camp which houses refugees fleeing the fighting in the Tigray region, on the Sudan-Ethiopia border in Sudan, November 29, 2020. REUTERS/Baz Ratner

A woman wears a skirt of a U.S. Pesident Trump's political flag as people gather to kick-off the March for Trump bus tour, a two week multi-state rally in support of U.S. President Donald Trump, in Doral, Florida, U.S., November 29, 2020. REUTERS/Maria Alejandra Cardona

People wearing masks against COVID-19 walk underneath Christmas illuminations on Gran Via street in Barcelona, Spain November 29, 2020. REUTERS/Nacho Doce

A man votes as election workers wearing face shields and masks wait at a polling station during the municipal elections in Sao Paulo, Brazil, November 29, 2020. REUTERS/Amanda Perobelli

A woman wearing a protective face mask pushes a baby stroller on a street amid the coronavirus disease (COVID-19) pandemic, in Nicosia, Cyprus November 29, 2020. REUTERS/Yiannis Kourtoglou

A woman wearing a protective face mask waits at a bus stop amid the coronavirus disease (COVID-19) pandemic, in Nicosia, Cyprus November 29, 2020. REUTERS/Yiannis Kourtoglou

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

A woman wearing a protective mask attends to cast her vote at a school during the municipal elections in Rio de Janeiro, Brazil, November 29, 2020. REUTERS/Pilar Olivares TPX IMAGES OF THE DAY

A woman wearing a protective mask attends to cast her vote at a school during the municipal elections in Rio de Janeiro, Brazil, November 29, 2020. REUTERS/Pilar Olivares

Soccer Football - Serie A - AC Milan v Fiorentina - San Siro, Milan, Italy - November 29, 2020 AC Milan's Zlatan Ibrahimovic wears a protective face mask as he looks on from the stands REUTERS/Alessandro Garofalo

Soccer Football - Serie A - AC Milan v Fiorentina - San Siro, Milan, Italy - November 29, 2020 AC Milan's Zlatan Ibrahimovic wears a protective face mask as he looks on from the stands REUTERS/Alessandro Garofalo

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - Serie A - AC Milan v Fiorentina - San Siro, Milan, Italy - November 29, 2020 AC Milan's Zlatan Ibrahimovic wears a protective face mask as he looks on from the stands REUTERS/Alessandro Garofalo

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea

Soccer Football - La Liga Santander - FC Barcelona v Osasuna - Camp Nou, Barcelona, Spain - November 29, 2020 FC Barcelona's Lionel Messi celebrates scoring their fourth goal wearing a Newell's Old Boys shirt in reference to former player Diego Maradona REUTERS/Albert Gea TPX IMAGES OF THE DAY

Soccer Football - Serie A - AC Milan v Fiorentina - San Siro, Milan, Italy - November 29, 2020 AC Milan's Zlatan Ibrahimovic wears a protective face mask as he looks on from the stands REUTERS/Alessandro Garofalo