Paramedic Patrick Hensel waits in front of a emergency room as people receive their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

European Health Commissioner Stella Kyriakides speaks during a plenary session on EU global strategy on COVID-19 vaccinations at the EU parliament in Brussels, Belgium January 19, 2021. John Thys/Pool via REUTERS

General view of the Kawasaki Heavy Industries' Tokyo Robot Centre, a facility that researches polymerase chain reaction (PCR) test automation, amid the coronavirus disease (COVID-19) pandemic, in Tokyo, Japan January 19, 2021. REUTERS/Akira Tomoshige

A person walks a dog, as the city prepares for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

A local flood warden walks past closed businesses, as the city prepares for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

Dr Ndaeyo Iwot, acting Executive Secretary, FCT Primary Healthcare Board, talks during an interview with Reuters in Abuja, Nigeria January 18, 2021. Picture taken January 18, 2021. REUTERS/Afolabi Sotunde

Dr Ndaeyo Iwot, acting Executive Secretary, FCT Primary Healthcare Board, talks during an interview with Reuters in Abuja, Nigeria January 18, 2021. Picture taken January 18, 2021. REUTERS/Afolabi Sotunde

Doctor Oluwajoba Oroge attends to a patient at EHA Clinics in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

People wait after receiving their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

A pulse oximeter is attached to a patient's finger to monitor oxygen intake within the body, at EHA Clinics in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

A healthcare worker adjusts a bed inside a treatment cubicle for coronavirus disease (COVID-19) patients at EHA Clinics in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

Doctor Oluwajoba Oroge walks at EHA Clinics in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

Italian Prime Minister Giuseppe Conte pauses as he addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Doctor Oluwajoba Oroge stands during an interview with Reuters in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

A healthcare professional works on a computer at EHA clinics, amid the coronavirus disease (COVID-19) outbreak in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

Doctor Oluwajoba Oroge walks at EHA Clinics in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

Japan's Health Minister Norihisa Tamura visits the Kawasaki Heavy Industries' Tokyo Robot Centre, a facility that researches polymerase chain reaction (PCR) test automation, amid the coronavirus disease (COVID-19) pandemic, in Tokyo, Japan January 19, 2021. REUTERS/Akira Tomoshige

Marielotte Kilian, 87, and Richard Kilian, 86, from Wiesbaden-Schierstein wait at the reception before receiving their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

A healthcare worker looks out from one of the containment cubicles at EHA Clinics amid the coronavirus disease (COVID-19) outbreak in Abuja, Nigeria January 14, 2021. Picture taken January 14, 2021. REUTERS/Afolabi Sotunde

Lega leader Matteo Salvini looks on as Italian Prime Minister Giuseppe Conte speaks ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Marielotte Kilian, 87, and Richard Kilian, 86, from Wiesbaden-Schierstein walk to the reception before receiving their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, and Richard Kilian, 86, from Wiesbaden-Schierstein wait at the reception before receiving their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, and Richard Kilian, 86, from Wiesbaden-Schierstein walk to the reception before receiving their Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, and Richard Kilian, 86, from Wiesbaden-Schierstein receive their Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Richard Kilian, 86, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Marielotte Kilian, 87, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

Italian Prime Minister Giuseppe Conte addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Marielotte Kilian, 87, from Wiesbaden-Schierstein receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from Fenna Martin on the opening day of a vaccination center at the Congress Center in Wiesbaden, Germany January 19, 2021. Arne Dedert/Pool via REUTERS

A person walks a dog, as the city prepares for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

Italian Prime Minister Giuseppe Conte addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Italian Prime Minister Giuseppe Conte addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Japan's Health Minister Norihisa Tamura visits the Kawasaki Heavy Industries' Tokyo Robot Centre, a facility that researches polymerase chain reaction (PCR) test automation, amid the coronavirus disease (COVID-19) pandemic, in Tokyo, Japan January 19, 2021. REUTERS/Akira Tomoshige

Variation annuelle en pourcentage du produit intérieur brut (PIB) depuis 2005.

Volcanic ash covers the roof of a car during an eruption of Mount Etna in Fleri, Italy, January 19, 2021. REUTERS/Antonio Parrinello

A man takes a dip during celebrations of the Orthodox Christian feast of Epiphany in Stavropol, Russia January 18, 2021. Picture taken January 18, 2021. REUTERS/Eduard Korniyenko

A woman takes a dip during celebrations of the Orthodox Christian feast of Epiphany near the village of Kosmos in Almaty Region, Kazakhstan January 19, 2021. REUTERS/Pavel Mikheyev

A local flood warden stands on a bridge overlooking the water to check on the river levels, as the city prepares for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

A tray with syringes containing the Pfizer/BioNTech vaccine against the coronavirus disease (COVID-19) are pictured on the opening day of a vaccination center at the Congress Center in Darmstadt, Germany January 19, 2021. Frank Rumpenhorst/Pool via REUTERS

Italian Prime Minister Giuseppe Conte addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

A tray with syringes containing the Pfizer/BioNTech vaccine against the coronavirus disease (COVID-19) are pictured on the opening day of a vaccination center at the Congress Center in Darmstadt, Germany January 19, 2021. Frank Rumpenhorst/Pool via REUTERS

Italian Prime Minister Giuseppe Conte addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Helmut Gaußmann, 85, from Messel waves to State Interior Minister Peter Beuth after he received the Pfizer/BioNTech coronavirus disease (COVID-19) vacination from nurse Juergen Lampert on the opening day of a vaccination center at the Congress Center in Darmstadt, Germany January 19, 2021. Frank Rumpenhorst/Pool via REUTERS

Former Italian Prime Minister Matteo Renzi waits for the arrival of Italian Prime Minister Giuseppe Conte ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

A woman walks her dog as the city prepares for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

Italian Prime Minister Giuseppe Conte adjusts his face mask prior to addressing senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Italian Prime Minister Giuseppe Conte gestures as he addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Italian Prime Minister Giuseppe Conte adjusts his face mask prior to addressing senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

A car is covered with volcanic ash during an eruption of Mount Etna in Fleri, Italy, January 19, 2021. REUTERS/Antonio Parrinello

Italian Prime Minister Giuseppe Conte gestures, next to Culture Minister Dario Franceschini, as he addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Italian Prime Minister Giuseppe Conte gestures, next to Culture Minister Dario Franceschini, as he addresses senators ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Lega leader Matteo Salvini looks on as Italian Prime Minister Giuseppe Conte speaks ahead of a confidence vote, at Palazzo Madama in Rome, Italy January 19, 2021. Andreas Solaro/Pool via REUTERS

Helmut Gaußmann, 85, from Messel waits after he received the Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Darmstadt, Germany January 19, 2021. Frank Rumpenhorst/Pool via REUTERS

A person pushing a stroller walks past businesses prepared for potential flooding due to the arrival of Storm Christoph, in Hebden Bridge, Britain, January 19, 2021. REUTERS/Phil Noble

Medical workers wait to register people before they receive a dose of a coronavirus disease (COVID-19) vaccine at a vaccination site, during a government-organised visit in Shanghai, China January 19, 2021. REUTERS/Aly Song

People fill forms before receiving a dose of a coronavirus disease (COVID-19) vaccine at a vaccination site, during a government-organised visit, following the coronavirus disease (COVID-19) outbreak, in Shanghai, China January 19, 2021. REUTERS/Aly Song

A healthcare worker receives a dose of COVISHIELD, a COVID-19 vaccine manufactured by Serum Institute of India, at Sola Civil Hospital in Ahmedabad, India, January 19, 2021. REUTERS/Amit Dave

Helmut Gaußmann, 85, from Messel receives the Pfizer/BioNTech coronavirus disease (COVID-19) vacination on the opening day of a vaccination center at the Congress Center in Darmstadt, Germany January 19, 2021. Frank Rumpenhorst/Pool via REUTERS