Tomoya Saito, Director at Center of Emergency Preparedness and Response (CEPR) of National Institute of Infectious Disease, attends a news conference after a roundtable meeting with medical experts to discuss on coronavirus disease (COVID-19) countermeasures hosted by the Tokyo 2020, in Tokyo, Japan April 30, 2021. REUTERS/Issei Kato/Pool

Tomoya Saito, Director at Center of Emergency Preparedness and Response (CEPR) of National Institute of Infectious Disease, attends a roundtable meeting with medical experts to discuss on coronavirus disease (COVID-19) countermeasures hosted by the Tokyo 2020 Organising Committee (Tokyo 2020), in Tokyo, Japan April 30, 2021. REUTERS/Issei Kato/Pool

Tomoya Saito (front), Director at Center of Emergency Preparedness and Response (CEPR) of National Institute of Infectious Disease, attends a joint news conference with Tokyo 2020 Olympic Committee (Tokyo 2020)'s Games Delivery Officer Hidemasa Nakamura after a roundtable meeting with medical experts to discuss on coronavirus disease (COVID-19) countermeasures hosted by the Tokyo 2020, in Tokyo, Japan April 30, 2021. REUTERS/Issei Kato/Pool

Seiko Hashimoto (R), President of the Tokyo 2020 Organising Committee (Tokyo 2020), attends a roundtable meeting with medical experts to discuss on coronavirus disease (COVID-19) countermeasures, with Tokyo 2020 Vice Presidents Toshiaki Endo (C) and Tomoya Saito, Director at Center of Emergency Preparedness and Response (CEPR) of National Institute of Infectious Disease, in Tokyo, Japan April 30, 2021. REUTERS/Issei Kato/Pool

European Commission President Ursula von der Leyen (C), EU Commissioner for Health and Food Safety Stella Kyriakides (L) and EU Commissioner for Internal Market Thierry Breton give a news conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Health and Food Safety Stella Kyriakides gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen reacts during a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Internal Market Thierry Breton gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Internal Market Thierry Breton gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Health and Food Safety Stella Kyriakides (L), European Commission President Ursula von der Leyen (C) and EU commissioner for Internal Market Thierry Breton give a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Internal Market Thierry Breton gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Health and Food Safety Stella Kyriakides gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Health and Food Safety Stella Kyriakides gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen (C), EU commissioner for Health and Food Safety Stella Kyriakides (L) and EU commissioner for Internal Market Thierry Breton give a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

EU commissioner for Health and Food Safety Stella Kyriakides gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

European Commission President Ursula von der Leyen gives a press conference on the EU's biodefence preparedness program meant to increase the bloc's capabilities to identify variants of the new coronavirus, at the European Commission Headquarters in Brussels, Belgium February 17, 2021. Aris Oikonomou/Pool via REUTERS

Members of the Israeli border police force take part in a drill that the Israeli police say tests their operational preparedness, at a beach along the shore of the Mediterranean Sea, in Ashkelon, southern Israel November 22, 2020. REUTERS/Amir Cohen

A woman walks past as members of the Israeli border police force take part in a drill that the Israeli police say tests their operational preparedness, at a beach along the shore of the Mediterranean Sea, in Ashkelon, southern Israel November 22, 2020. REUTERS/Amir Cohen

Members of the Israeli border police force take their positions during a drill that the Israeli police say tests their operational preparedness, at a beach along the shore of the Mediterranean Sea, in Ashkelon, southern Israel November 22, 2020. REUTERS/Amir Cohen

Members of the Israeli border police force take part in a drill that the Israeli police say tests their operational preparedness, at a beach along the shore of the Mediterranean Sea, in Ashkelon, southern Israel November 22, 2020. REUTERS/Amir Cohen

U.N. Secretary-General's Special Envoy for Ebola David Nabarro addresses the media on World Health Organization (WHO)'s health emergency preparedness and response capacities in Geneva, Switzerland, July 31, 2015. REUTERS/Pierre Albouy

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair (on a screen) takes part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Fisheries and Oceans, and Canadian Coast Guard Bernadette Jordan (on a screen), Minister of Indigenous Services Marc Miller and Minister of Public Safety and Emergency Preparedness Bill Blair take part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair listens to Minister of Indigenous Services Marc Miller during a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Indigenous Services Marc Miller and Minister of Public Safety and Emergency Preparedness Bill Blair take part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Indigenous Services Marc Miller and Minister of Public Safety and Emergency Preparedness Bill Blair take part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair takes part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair takes part in a news conference about the dispute between commercial and Mi'kmaw lobster fishers in Nova Scotia, on Parliament Hill in Ottawa, Ontario, Canada October 19, 2020. REUTERS/Blair Gable

Canada's Minister of Public Safety and Emergency Preparedness Bill Blair speaks during Question Period in the House of Commons on Parliament Hill in Ottawa, Ontario, Canada September 24, 2020. REUTERS/Blair Gable

Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, speaks during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, speaks during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, speaks during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Admiral Brett Giroir, Assistant Secretary For Health Department of Health and Human Services, Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, and Robert R. Redfield, Director for Centers for Disease Control and Prevention, arrive to a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Admiral Brett Giroir, Assistant Secretary For Health Department of Health and Human Services, Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, and Robert R. Redfield, Director for Centers for Disease Control and Prevention, arrive to a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Robert R. Redfield, Director for Centers for Disease Control and Prevention, Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, and Admiral Brett Giroir, Assistant Secretary For Health Department of Health and Human Services, look at their notes during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, and Admiral Brett Giroir, Assistant Secretary For Health Department of Health and Human Services, look at their notes during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Bob Kadlec, Assistant Secretary For Preparedness And Response Department of Health and Human Services, listens during a hearing with the Senate Appropriations Subcommittee on Labor, Health and Human Services, Education, and Related Agencies, on Capitol Hill in Washington, U.S., September 16, 2020. Anna Moneymaker/Pool via REUTERS

Health and Human Services Assistant Secretary for Preparedness and Response Dr. Bob Kadlec speaks at a Senate Appropriations Subcommittee hearing "Review of Coronavirus Response Efforts" on Capitol Hill in Washington, U.S., September 16, 2020. Andrew Harnik/Pool via REUTERS

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event with Florida Governor Ron DeSantis at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner TPX IMAGES OF THE DAY

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event with Florida Governor Ron DeSantis and U.S. Health and Human Services (HHS) Secretary Alex Azar at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event with Florida Governor Ron DeSantis and U.S. Health and Human Services (HHS) Secretary Alex Azar at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump participates in a "COVID-19 Response and Storm Preparedness" event with Florida Governor Ron DeSantis and U.S. Health and Human Services (HHS) Secretary Alex Azar at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

Florida Governor Ron DeSantis speaks as he participates in a "COVID-19 Response and Storm Preparedness" event with U.S. President Donald Trump at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. Health and Human Services (HHS) Secretary Alex Azar listens as he attends a "COVID-19 Response and Storm Preparedness" event with U.S. President Donald Trump at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. Health and Human Services (HHS) Secretary Alex Azar listens as he attends a "COVID-19 Response and Storm Preparedness" event with U.S. President Donald Trump at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

U.S. President Donald Trump speaks during a "COVID-19 Response and Storm Preparedness" event at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

Florida Governor Ron DeSantis listens as he attends a "COVID-19 Response and Storm Preparedness" event with U.S. President Donald Trump at the Pelican Golf Club in Belleair, Florida, U.S., July 31, 2020. REUTERS/Tom Brenner

European Health Commissioner Stella Kyriakides wears a protective mask on the sidelines of a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas and European Health Commissioner Stella Kyriakides leave the podium after addressing a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas puts his protective mask on after addressing a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Health Commissioner Stella Kyriakides speaks at a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas and European Health Commissioner Stella Kyriakides participate in a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas and European Health Commissioner Stella Kyriakides participate in a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas speaks during a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS

European Commission Vice-President Margaritis Schinas speaks during a media conference on preparedness for possible future outbreaks of the coronavirus disease (COVID-19), at EU headquarters in Brussels, Belgium July 15, 2020. Francisco Seco/Pool via REUTERS