A nurse displays a vial of AstraZeneca's COVISHIELD vaccine, during the coronavirus disease (COVID-19) vaccination campaign, at a medical centre in Mumbai, India, January 16, 2021. REUTERS/Francis Mascarenhas

A healthcare worker receives a Bharat Biotech's COVID-19 vaccine called COVAXIN, during the coronavirus disease (COVID-19) vaccination campaign at All India Institute of Medical Sciences (AIIMS) hospital in New Delhi, India, January 16, 2021. REUTERS/Adnan Abidi

A healthcare worker receives an AstraZeneca's COVISHIELD vaccine, during the coronavirus disease (COVID-19) vaccination campaign, at a medical centre in Mumbai, India, January 16, 2021. REUTERS/Francis Mascarenhas

Indian Health Minister Harsh Vardhan holds a dose of Bharat Biotech's COVID-19 vaccine called COVAXIN, during a vaccination campaign at All India Institute of Medical Sciences (AIIMS) hospital in New Delhi, India, January 16, 2021. REUTERS/Adnan Abidi

A healthcare worker receives a Bharat Biotech's COVID-19 vaccine called COVAXIN, during the coronavirus disease (COVID-19) vaccination campaign at All India Institute of Medical Sciences (AIIMS) hospital in New Delhi, India, January 16, 2021. REUTERS/Adnan Abidi

Police detain a Buddhist monk while he takes part in a protest in support of the jailed nationalist right wing monk Wirathu outside Insein prison in Yangon, Myanmar, January 16, 2021. REUTERS/Shwe Paw Mya Tin

A healthcare worker receives a Bharat Biotech's COVID-19 vaccine called COVAXIN, during the coronavirus disease (COVID-19) vaccination campaign at All India Institute of Medical Sciences (AIIMS) hospital in New Delhi, India, January 16, 2021. REUTERS/Adnan Abidi

A paramedic fills a syringe with COVISHIELD, a COVID-19 vaccine manufactured by Serum Institute of India, before administering it to a colleague during one of the world's largest COVID-19 vaccination campaigns at a health centre in Ahmedabad, India, January 16, 2021. REUTERS/Amit Dave

Indian Health Minister Harsh Vardhan holds a dose of Bharat Biotech's COVID-19 vaccine called COVAXIN, during a vaccination campaign at All India Institute of Medical Sciences (AIIMS) hospital in New Delhi, India, January 16, 2021. REUTERS/Adnan Abidi

Police detain a nationalist supporter while he takes part in a protest in support of the jailed nationalist right wing monk Wirathu outside Insein prison in Yangon, Myanmar, January 16, 2021. REUTERS/Shwe Paw Mya Tin

Police clash with Buddhist monks while they take part in a protest in support of the jailed nationalist right wing monk Wirathu outside Insein prison in Yangon, Myanmar, January 16, 2021. REUTERS/Shwe Paw Mya Tin

Police detain a Buddhist monk while he takes part in a protest in support of the jailed nationalist right wing monk Wirathu outside Insein prison in Yangon, Myanmar, January 16, 2021. REUTERS/Shwe Paw Mya Tin

A vendor wearing a face mask and a face shield as protection against the coronavirus disease (COVID-19) repacks cooking oil at a market, in Manila, Philippines, January 16, 2021. REUTERS/Lisa Marie David

A fish vendor tends to her products at her stall at a market, in Manila, Philippines, January 16, 2021. REUTERS/Lisa Marie David

Police officers wearing face masks and face shields as protection against the coronavirus disease (COVID-19) carry wooden baton as they enforce safety protocols at a market, in Manila, Philippines, January 16, 2021. REUTERS/Lisa Marie David

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

Healthcare workers and hospital staff stand in a room set up for COVID-19 vaccinations at the Max hospital amid the outbreak of the coronavirus disease (COVID-19) in New Delhi, India January 16, 2021. REUTERS/Anushree Fadnavis

Healthcare workers and hospital stand at the entrance of a COVID-19 vaccination centre, at the Max hospital amid the outbreak of the coronavirus disease (COVID-19) in New Delhi, India January 16, 2021. REUTERS/Anushree Fadnavis

People wearing face masks as protection against the coronavirus disease (COVID-19) shop at a market, in Manila, Philippines, January 16, 2021. REUTERS/Lisa Marie David

People wearing face masks as protection against the coronavirus disease (COVID-19) shop at a market, in Manila, Philippines, January 16, 2021. REUTERS/Lisa Marie David

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

A woman carrying her baby takes part in a new caravan of migrants, set to head to the United States, as they cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

Hondurans taking part in a new caravan of migrants, set to head to the United States, cross the El Florido border crossing point into Guatemala, in El Florido, Guatemala January 15, 2021. REUTERS/Luis Echeverria

A woman stands outside a COVID-19 vaccination centre at the Max hospital amid the outbreak of the coronavirus disease (COVID-19) in New Delhi, India January 16, 2021. REUTERS/Anushree Fadnavis

Healthcare workers watch Indian Prime Minister Narendra Modi addressing them through video conferencing to launch one of the world's largest COVID-19 vaccination campaigns at a government-run hospital in Kolkata, India, January 16, 2021. REUTERS/Rupak De Chowdhuri

Healthcare workers watch Indian Prime Minister Narendra Modi addressing them through video conferencing to launch one of the world's largest COVID-19 vaccination campaigns at a government-run hospital in Kolkata, India, January 16, 2021. REUTERS/Rupak De Chowdhuri

A worker prepares for a disinfection operation, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

A firefighter wearing a protective mask has his body temperature checked before a disinfection operation, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

Firefighters wearing protective masks gather before a disinfection operation, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

A firefighter sprays disinfectant at a business area, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

Firefighters wearing protective masks gather before a disinfection operation, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

Firefighters wearing protective masks gather before a disinfection operation, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

A firefighter sprays disinfectant at a business area, during a lockdown due to the coronavirus disease (COVID-19) outbreak, in Kuala Lumpur, Malaysia January 16, 2021. REUTERS/Lim Huey Teng

The new section of the bollard-type border wall erected in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

A member of a construction crew works on a new section of the bollard-type border wall in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

A member of a construction crew using heavy machinery works on a new section of the bollard-type border wall in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

Members of a construction crew using heavy machinery work on a new section of the bollard-type border wall in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

A member of a construction crew works on a new section of the bollard-type border wall in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

A general view shows a new section of the bollard-type border wall erected in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

Members of a construction crew work on a new section of the bollard-type border wall in Sunland Park, New Mexico, U.S., as seen from the Mexican side of the border in Ciudad Juarez, Mexico January 15, 2021. REUTERS/Jose Luis Gonzalez

People drive through the Jurassic Quest Experience outside The Rose Bowl Stadium during the outbreak of the coronavirus disease (COVID-19), in Pasadena, California, U.S., January 15, 2021. REUTERS/Mario Anzuoni

People drive through the Jurassic Quest Experience outside The Rose Bowl Stadium during the outbreak of the coronavirus disease (COVID-19), in Pasadena, California, U.S., January 15, 2021. REUTERS/Mario Anzuoni

U.S. Health and Human Services (HHS) Secretary Alex Azar speaks during a news conference in the Brady Press Briefing Room of the White House in Washington, U.S. August 23, 2020. Picture taken August 23, 2020. REUTERS/Erin Scott

U.S. President Donald Trump and Health and Human Services (HHS) Secretary Alex Azar attend a news conference about the latest coronavirus disease (COVID-19) developments, in the Brady Press Briefing Room of the White House in Washington, U.S. August 23, 2020. Picture taken August 23, 2020. REUTERS/Erin Scott

A Falck/Care Ambulance drives to a patient, as the spread of the coronavirus disease (COVID-19) continues, in Pomona, California, U.S., January 14, 2021. Picture taken January 14, 2021. REUTERS/Lucy Nicholson

Falck/Care Ambulance Service EMT Jake Hailey waits for calls, as the spread of the coronavirus disease (COVID-19) continues, in Pomona, California, U.S., January 14, 2021. Picture taken January 14, 2021. REUTERS/Lucy Nicholson

Falck/Care Ambulance Service EMTs wait for calls, as the spread of the coronavirus disease (COVID-19) continues, in Pomona, California, U.S., January 14, 2021. Picture taken January 14, 2021. REUTERS/Lucy Nicholson

Falck/Care Ambulance Service EMTs transport a patient, as the spread of the coronavirus disease (COVID-19) continues, in Rowland Heights, California, U.S., January 14, 2021. Picture taken January 14, 2021. REUTERS/Lucy Nicholson

DuAnne Kinzer, 84, and Donald Caster, 88, prepare to receive the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

June Mudd, 96, prepares to receive the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

World War II veteran William Lloyd Roberts, 94, and his wife, Erma Lee Hanna Roberts, 91, sit as they wait to receive the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Al Flippin, 87, receives the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Michael Hernandez, 68, receives the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Eunice Val, 88, receives the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Donald Petrie, 82, receives the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Joyce Flippin, 83, receives the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson

Joyce Flippin, 83, and Al Flippin, 87, line up to receive the coronavirus disease (COVID-19) vaccine at Mission Commons assisted living community in Redlands, California, U.S., January 15, 2021. REUTERS/Lucy Nicholson