People observe social distancing as they watch U.S. President Joe Biden speak after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden and first lady Jill Biden tour a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden speaks after touring a Federal Emergency Management Agency (FEMA) vaccination facility for the coronavirus disease (COVID-19) at NRG Stadium in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden, Texas Governor Greg Abbott and Harris County Judge Lina Hidalgo visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden visits the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden, Texas Governor Greg Abbott and Harris County Judge Lina Hidalgo visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden, Texas Governor Greg Abbott and Harris County Judge Lina Hidalgo visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden, Texas Governor Greg Abbott and Harris County Judge Lina Hidalgo visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden and Texas Governor Greg Abbott visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden visits the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden, Texas Governor Greg Abbott and Harris County Judge Lina Hidalgo visit the Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden and Texas Governor Greg Abbott visit Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden and Texas Governor Greg Abbott visit Harris County Emergency Operations Center, in Houston, Texas, U.S., February 26, 2021. REUTERS/Jonathan Ernst

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran visits the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran and French Junior Minister of Autonomy Brigitte Bourguignon visit the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

French Health Minister Olivier Veran visits the coronavirus disease (COVID-19) emergency and intensive care units of the Hospital Centre in Dunkirk, February 24, 2021. Denis Charlet/Pool via REUTERS

Senate Minority Leader Mitch McConnell emerges to speak to reporters after the Republican weekly policy lunch on Capitol Hill in Washington, U.S., February 23, 2021. REUTERS/Kevin Lamarque

U.S. President Joe Biden is seen with St. Louis, Missouri firefighter emergency medical technician Demetris “Al” Alfred and Columbus, Ohio childcare worker Carmen Palmer as he meets with a group of black essential workers to thank them for their efforts throughout the coronavirus pandemic during an online discussion in the South Court Auditorium at the White House in Washington, U.S., February 23, 2021. REUTERS/Jonathan Ernst

U.S. President Joe Biden meets with St. Louis, Missouri firefighter emergency medical technician Demetris “Al” Alfred; Chicago, Illinois pharmacist Melanie Owens; child care worker Carmen Palmer, from Columbus, Ohio; and Cedar Rapids, Iowa grocery store manager Jeff Carter during an online discussion with a group of black essential workers to thank them for their efforts throughout the coronavirus pandemic, in the South Court Auditorium at the White House in Washington, U.S., February 23, 2021. REUTERS/Jonathan Ernst

A man emerges from the water at Vico Road bathing place, amid the coronavirus disease (COVID-19) outbreak in Dublin, Ireland February 22, 2021. REUTERS/Clodagh Kilcoyne

The cable car, closed due to the coronavirus disease (COVID-19) emergency, is seen during a visit of alpine rescuers, members of the "Guardia di Finanza", a local police force, to a crater on Mount Etna, Europe's highest and most active volcano, near Catania, Italy, February 19, 2021. REUTERS/Antonio Parrinello

The cable car, closed due to the coronavirus disease (COVID-19) emergency, is seen as alpine rescuers, members of the "Guardia di Finanza", a local police force, visit a crater on Mount Etna, Europe's highest and most active volcano, near Catania, Italy, February 19, 2021. REUTERS/Antonio Parrinello

Dr. Silvia Alejandra Gelvez, an emergency medicine doctor at the Colombia Clinic, receives an injection with a dose of the Pfizer-BioNTech COVID-19 vaccine at the Colombia Clinic in Bogota, Colombia February 18, 2021. REUTERS/Luisa Gonzalez

Dr. Silvia Alejandra Gelvez, an emergency medicine doctor at the Colombia Clinic, gestures as she receives an injection with a dose of the Pfizer-BioNTech COVID-19 vaccine at the Colombia Clinic in Bogota, Colombia February 18, 2021. REUTERS/Luisa Gonzalez

Dr. Silvia Alejandra Gelvez, an emergency medicine doctor at the Colombia Clinic, gestures before receiving an injection with a dose of the Pfizer-BioNTech COVID-19 vaccine at the Colombia Clinic in Bogota, Colombia February 18, 2021. REUTERS/Luisa Gonzalez

White House Deputy National Security Advisor for Cyber and Emerging Technology Anne Neuberger gives an update on the Biden administration's response to the SolarWinds hack during the daily briefing at the White House in Washington, D.C., U.S. February 17, 2021. REUTERS/Leah Millis

White House Deputy National Security Advisor for Cyber and Emerging Technology Anne Neuberger gives an update on the Biden administration's response to the SolarWinds hack during the daily briefing at the White House in Washington, D.C., U.S. February 17, 2021. REUTERS/Leah Millis

White House Deputy National Security Advisor for Cyber and Emerging Technology Anne Neuberger gives an update on the Biden administration's response to the SolarWinds hack during the daily briefing at the White House in Washington, D.C., U.S. February 17, 2021. REUTERS/Leah Millis

Medical workers wearing personal protective equipment (PPE) examine a patient at the Emergency Department in the Kuala Lumpur Hospital, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia February 16, 2021. REUTERS/Lim Huey Teng

Medical workers wearing personal protective equipment (PPE) examine a patient at the Emergency Department in the Kuala Lumpur Hospital, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia February 16, 2021. REUTERS/Lim Huey Teng

Medical workers wearing personal protective equipment (PPE) work at the Emergency Department in the Kuala Lumpur Hospital, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia February 16, 2021. REUTERS/Lim Huey Teng

Medical workers wearing personal protective equipment (PPE) work at the Emergency Department in the Kuala Lumpur Hospital, amid the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia February 16, 2021. REUTERS/Lim Huey Teng

Members of emergency services work at the site of a collapsed building after an explosion in Vladikavkaz, Russia February 12, 2021. REUTERS/Kazbek Basayev

Members of emergency services work at the site of a collapsed building after an explosion in Vladikavkaz, Russia February 12, 2021. REUTERS/Kazbek Basayev

An electoral poster of former Catalan separatist leader Carles Puigdemont for Junts per Catalunya party is seen on the empty Rambla de Catalunya street ahead of the February 14 regional election, during a night-time curfew set as part of a state of emergency in an effort to control the outbreak of the coronavirus disease (COVID-19), in Barcelona, Spain February 10, 2021. Picture taken February 10, 2021. REUTERS/Nacho Doce

An electoral poster of Salvador Illa, leader of Catalonia from the Socialist Party of Catalonia (PSC), is seen on the empty Gran Via street ahead of the February 14 regional election, during a night-time curfew set as part of a state of emergency in an effort to control the outbreak of the coronavirus disease (COVID-19), in Barcelona, Spain February 11, 2021. REUTERS/Nacho Doce

An electoral poster of Catalan separatist leader Oriol Junqueras for the Catalan Left Republican party (ERC) is seen on empty Diagonal avenue ahead of the February 14 regional election, during a night-time curfew set as part of a state of emergency in an effort to control the outbreak of the coronavirus disease (COVID-19), in Barcelona, Spain February 10, 2021. Picture taken February 10, 2021. REUTERS/Nacho Doce

A healthcare worker in protective gear assists a patient into an ambulance outside the emergency unit of the Hospital Universitario La Paz during the coronavirus disease (COVID-19) outbreak in Madrid, Spain February 10, 2021. REUTERS/Susana Vera

An emergency services vehicle is seen outside Citi Field, the home stadium of the MLB's New York Mets, one day ahead of the opening of a portion of the baseball park as a COVID-19 mass vaccination site during the coronavirus disease pandemic in the Queens borough of New York City, New York, U.S., February 9, 2021. REUTERS/Brendan McDermid

An emergency services vehicle arrives at Citi Field, the home stadium of the MLB's New York Mets, one day ahead of the opening of a portion of the baseball park as a COVID-19 mass vaccination site during the coronavirus disease (COVID-19) pandemic in the Queens borough of New York City, New York, U.S., February 9, 2021. REUTERS/Brendan McDermid

An emergency services vehicle is seen outside Citi Field, the home stadium of the MLB's New York Mets, one day ahead of the opening of a portion of the baseball park as a COVID-19 mass vaccination site during the coronavirus disease (COVID-19) pandemic in the Queens borough of New York City, New York, U.S., February 9, 2021. REUTERS/Brendan McDermid

Toronto police officers, enforcing provincial emergency COVID measures, detain a pro-life demonstrator who was marching with a group protesting against coronavirus disease (COVID-19) restrictions in Toronto, Ontario, Canada February 6, 2021. REUTERS/Kyaw Soe Oo

Emergency services attend the place of a fatal road crash, at the C50 road, following three major incidents reported in Kilmarnock, Scotland, Britain, February 5, 2021. REUTERS/Russell Cheyne

Emergency services attend the place of a fatal road crash, at the C50 road, following three major incidents reported in Kilmarnock, Scotland, Britain, February 5, 2021. REUTERS/Russell Cheyne

Emergency services attend the place of a fatal road crash, at the C50 road, following three major incidents reported in Kilmarnock, Scotland, Britain, February 5, 2021. REUTERS/Russell Cheyne

Workers of SUMMA112, Madrid's Regional Emergency Service, wait next to an ambulance after receiving their second dose of the Pfizer-BioNTech COVID-19 vaccine, as the coronavirus disease (COVID-19) outbreak continues, in Madrid, Spain, February 5, 2021. REUTERS/Sergio Perez

A worker of SUMMA112, Madrid's Regional Emergency Service, receives his second dose of the Pfizer-BioNTech COVID-19 vaccine, as the coronavirus disease (COVID-19) outbreak continues, in Madrid, Spain, February 5, 2021. REUTERS/Sergio Perez