Doctor Carlos Herrera leaves the house of an elderly woman after administering the second dose of the China's SINOVAC vaccine against the coronavirus disease (COVID-19) to her, as Chile starts applying the second dose of the COVID-19 vaccine to its elderly citizens, in Santiago, Chile March 3, 2021. Picture taken March 3, 2021. REUTERS/Ivan Alvarado

Doctor Carlos Herrera prepares to check an elderly woman inside her room after receiving the second dose of the China's SINOVAC vaccine against the coronavirus disease (COVID-19), at her home, as Chile starts applying the second dose of the COVID-19 vaccine to its elderly citizens, in Santiago, Chile March 3, 2021. Picture taken March 3, 2021. REUTERS/Ivan Alvarado

Doctor Carlos Herrera prepares to administer the second dose of the China's SINOVAC vaccine against the coronavirus disease (COVID-19) to an elderly woman, as Chile starts applying the second dose of the COVID-19 vaccine to its elderly citizens, in Santiago, Chile March 4, 2021. REUTERS/Ivan Alvarado

A Turkish doctor prepares a dose of Sinovac's CoronaVac coronavirus disease (COVID-19) vaccine for a foreign citizen living in Turkey at a healthcare centre as nationwide vaccination continues for seniors, in the Mediterranean town of Side, in Antalya province, Turkey March 4, 2021. REUTERS/Kaan Soyturk

Doctor Nabough al-Awa, a member of the country's coronavirus advisory committee, speaks during an interview with Reuters in Damascus, Syria March 4, 2021. REUTERS/Firas Makdesi

Doctor Nabough al-Awa, a member of the country's coronavirus advisory committee, speaks during an interview with Reuters in Damascus, Syria March 4, 2021. REUTERS/Firas Makdesi

Members of aid group Doctors Without Borders (MSF) demonstrate outside the World Trade Organization to waive intellectual property rights on coronavirus disease (COVID-19) drugs ahead of next week meeting on WTO's Trade-Related Aspects of Intellectual Property (TRIPS) agreement in Geneva, Switzerland March 4, 2021. REUTERS/Denis Balibouse

Stephen Cornish, General director for the opperational Center of Doctors Without Borders (MSF) demonstrates outside the World Trade Organization to waive intellectual property rights on coronavirus disease (COVID-19) drugs ahead of next week meeting on WTO's Trade-Related Aspects of Intellectual Property (TRIPS) agreement in Geneva, Switzerland March 4, 2021. REUTERS/Denis Balibouse

Stephen Cornish, General director for the opperational Center of Doctors Without Borders (MSF) demonstrates outside the World Trade Organization to waive intellectual property rights on coronavirus disease (COVID-19) drugs ahead of next week meeting on WTO's Trade-Related Aspects of Intellectual Property (TRIPS) agreement in Geneva, Switzerland March 4, 2021. REUTERS/Denis Balibouse

Members of aid group Doctors Without Borders (MSF) demonstrate outside the World Trade Organization to waive intellectual property rights on coronavirus disease (COVID-19) drugs ahead of next week meeting on WTO's Trade-Related Aspects of Intellectual Property (TRIPS) agreement in Geneva, Switzerland March 4, 2021. REUTERS/Denis Balibouse

Members of aid group Doctors Without Borders (MSF) demonstrate outside the World Trade Organization to waive intellectual property rights on coronavirus disease (COVID-19) drugs ahead of next week meeting on WTO's Trade-Related Aspects of Intellectual Property (TRIPS) agreement in Geneva, Switzerland March 4, 2021. REUTERS/Denis Balibouse

Doctors Ines Veselinovic and Suzana Stojanovic stand at the intensive care unit of the Clinical Hospital Center, where they treat patients suffering from the coronavirus disease (COVID-19), in Nis, Serbia, March 3, 2021. REUTERS/Marko Djurica

Doctors Ines Veselinovic and Suzana Stojanovic stand at the intensive care unit of the Clinical Hospital Center, where they treat patients suffering from the coronavirus disease (COVID-19), in Nis, Serbia, March 3, 2021. REUTERS/Marko Djurica

A vaccination card is shown, as the AstraZeneca COVID-19 vaccine is administered in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A package of the AstraZeneca COVID-19 vaccine is shown in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A package of the AstraZeneca COVID-19 vaccine is shown in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Chairs for waiting to receive the AstraZeneca COVID-19 vaccines are seen outside, in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A nurse rests outside after receiving the AstraZeneca COVID-19 vaccine in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Stickers of the AstraZeneca COVID-19 vaccine are shown in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A vaccination card is shown, as the AstraZeneca COVID-19 vaccine is administered in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

People wait to receive the AstraZeneca COVID-19 vaccine in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A nurse receives the AstraZeneca COVID-19 vaccine in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A health worker checks the temperature of the nurse before vaccination, in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Health workers go out from the surgery in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

A man receives the AstraZeneca COVID-19 vaccine in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Syringes are seen on the table, in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Syringes are seen on the table, in the state of Brandenburg where the first coronavirus vaccinations are given in doctors' surgeries, in Senftenberg, Germany, March 3, 2021. REUTERS/Hannibal Hanschke/Pool

Doctor Lukasz Grabarczyk sits inside the coronavirus disease (COVID-19) ward at the University Clinical Hospital in Olsztyn, Poland, March 2, 2021. Picture taken March 2, 2021. REUTERS/Kuba Stezycki

Myanmar’s security forces have detained more than 1,200 people since the military seized power in a coup on Feb. 1, overthrowing elected leader Aung San Suu Kyi.

Doctor Amani Simplice, a health worker, receives a vaccination against the coronavirus disease (COVID-19) during a vaccination campaign in Abidjan, Ivory Coast March 1, 2021. REUTERS/Luc Gnago

Spanish-speaking doctors address seniors' concerns about the coronavirus disease (COVID-19) vaccinations during an event organised by the Mexican consulate and local health officials in Atlanta, Georgia, U.S., February 27, 2021. REUTERS/Amira Karaoud

A sign reading "Here you have the opportunity to talk briefly with the doctor" is placed at the waiting area as nursery school teachers receive their dose of AstraZeneca's vaccine against the coronavirus disease (COVID-19) in Bremen, Germany, February 26, 2021. Hauke-Christian Dittrich/Pool via REUTERS

Family doctor Csaba Denes gives a dose of the Sinopharm coronavirus disease (COVID-19) vaccine to a patient, in Budapest, Hungary February 26, 2021. REUTERS/Bernadett Szabo

Family doctor Csaba Denes gives a dose of the Sinopharm coronavirus disease (COVID-19) vaccine to a patient, in Budapest, Hungary February 26, 2021. REUTERS/Bernadett Szabo

Family doctor Csaba Denes gives a dose of the Sinopharm coronavirus disease (COVID-19) vaccine to a patient, in Budapest, Hungary February 26, 2021. REUTERS/Bernadett Szabo

Family doctor Csaba Denes gives a dose of the Sinopharm coronavirus disease (COVID-19) vaccine to a patient, in Budapest, Hungary February 26, 2021. REUTERS/Bernadett Szabo

Family doctor Csaba Denes holds a box of the Sinopharm coronavirus disease (COVID-19) vaccine, in Budapest, Hungary February 26, 2021. REUTERS/Bernadett Szabo

French doctor, professor in pediatric immunology and president of the vaccine orientation council Alain Fischer speaks during a press conference on the government's current strategy for the ongoing coronavirus disease (COVID-19) pandemic in Paris, France February 25, 2021. Stephane De Sakutin/Pool via REUTERS

French doctor, professor in pediatric immunology and president of the vaccine orientation council Alain Fischer speaks during a press conference on the government's current strategy for the ongoing coronavirus disease (COVID-19) pandemic in Paris, France February 25, 2021. Stephane De Sakutin/Pool via REUTERS

French doctor, professor in pediatric immunology and president of the vaccine orientation council Alain Fischer speaks during a press conference on the government's current strategy for the ongoing coronavirus disease (COVID-19) pandemic in Paris, France February 25, 2021. Stephane De Sakutin/Pool via REUTERS

French doctor, professor in pediatric immunology and president of the vaccine orientation council Alain Fischer speaks during a press conference on the government's current strategy for the ongoing coronavirus disease (COVID-19) pandemic in Paris, France February 25, 2021. Stephane De Sakutin/Pool via REUTERS

A doctor prepares a dose of the Oxford-AstraZeneca COVID-19 vaccine in his consulting room at the doctor's office in Gouzeaucourt as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 24, 2021. Picture taken on February 24, 2021. REUTERS/Pascal Rossignol

A teddy bear, wearing a protective face mask, is seen in a pharmacy in Gouzeaucourt amid the coronavirus disease (COVID-19) outbreak in France, February 25, 2021. REUTERS/Pascal Rossignol

Vials of the Oxford-AstraZeneca COVID-19 vaccine is seen in the fridge of a doctor's office in Gouzeaucourt as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 24, 2021. Picture taken on February 24, 2021. REUTERS/Pascal Rossignol

A 101 year old patient receives a dose of the Pfizer-BioNTech vaccine by a nurse at her house in Gonnelieu as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 25, 2021. REUTERS/Pascal Rossignol

A doctor, wearing a protective face mask, prepares a dose of the Oxford-AstraZeneca COVID-19 vaccine in his consulting room at the doctor's office in Gouzeaucourt as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 24, 2021. Picture taken on February 24, 2021. REUTERS/Pascal Rossignol

A bedridden elderly patient receives a dose of the Pfizer-BioNTech vaccine by a doctor and a nurse at her home in Banteux as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 25, 2021. REUTERS/Pascal Rossignol

An elderly patient receives a dose of the Pfizer-BioNTech vaccine by a doctor and a nurse at his home in Banteux as part of the coronavirus disease (COVID-19) vaccination campaign in France, February 25, 2021. REUTERS/Pascal Rossignol

Hussain Ahmed reacts as he receives a coronavirus disease (COVID-19) vaccine from doctor Waheed Hussain, at Bradford Central Mosque, amid the COVID-19 outbreak in Bradford, Britain, February 25, 2021. REUTERS/Jason Cairnduff

Greek hospital doctors and staff take part in a demonstration against a lack of intensive care units at public hospitals, amidst the spread of the coronavirus disease (COVID-19) in Athens, Greece, February 23, 2021. REUTERS/Louiza Vradi

Demonstrators stand next to police officers as Greek hospital doctors and staff take part in a demonstration against a lack of intensive care units at public hospitals, amidst the spread of the coronavirus disease (COVID-19) in Athens, Greece, February 23, 2021. REUTERS/Louiza Vradi

Greek hospital doctors and staff take part in a demonstration against a lack of intensive care units at public hospitals, amidst the spread of the coronavirus disease (COVID-19), in Athens, Greece, February 23, 2021. REUTERS/Louiza Vradi

A demonstrator wearing a protective face mask holds a banner as Greek hospital doctors and staff take part in a demonstration against a lack of intensive care units at public hospitals, amidst the spread of the coronavirus disease (COVID-19), in Athens, Greece, February 23, 2021. REUTERS/Louiza Vradi

Greek hospital doctors and staff take part in a demonstration against a lack of intensive care units at public hospitals, amidst the spread of the coronavirus disease (COVID-19), in Athens, Greece, February 23, 2021. The banner reads "Dozens health workers dead". REUTERS/Louiza Vradi

Doctors and nurses wait to receive China's Sinovac vaccine against the coronavirus disease (COVID-19) at a community vaccination centre in Hong Kong, China February 23, 2021. Peter Parks/Pool via REUTERS

Doctors wait at their vaccination booths for people at the HSE (Health Service Executive) mass vaccination centre for people over 85 years old at The Helix theatre, amid the outbreak of the coronavirus disease (COVID-19), in Dublin, Ireland February 20, 2021. REUTERS/Clodagh Kilcoyne

Annalisa Malara, the doctor who diagnosed the first Italian patient with COVID-19, along with Dr. Ricevuti on February 20, 2020, poses for a photograph at San Matteo Hospital in Pavia one year after Codogno became Europe's coronavirus disease (COVID-19) epicenter, Italy, February 18, 2021. Picture taken February 18, 2021. REUTERS/Flavio Lo Scalzo

Annalisa Malara, the doctor who diagnosed the first Italian patient with COVID-19, along with Dr. Ricevuti on February 20, 2020, poses for a photograph at San Matteo Hospital in Pavia one year after Codogno became Europe's coronavirus disease (COVID-19) epicenter, Italy, February 18, 2021. Picture taken February 18, 2021. REUTERS/Flavio Lo Scalzo

Annalisa Malara, the doctor who diagnosed the first Italian patient with COVID-19, along with Dr. Ricevuti on February 20, 2020, poses for a photograph at San Matteo Hospital in Pavia one year after Codogno became Europe's coronavirus disease (COVID-19) epicenter, Italy, February 18, 2021. Picture taken February 18, 2021. REUTERS/Flavio Lo Scalzo

Annalisa Malara, the doctor who diagnosed the first Italian patient with COVID-19, along with Dr. Ricevuti on February 20, 2020, poses for a photograph at San Matteo Hospital in Pavia one year after Codogno became Europe's coronavirus disease (COVID-19) epicenter, Italy, February 18, 2021. Picture taken February 18, 2021. REUTERS/Flavio Lo Scalzo