Anthony Fauci, MD, Director, National Institute of Allergy and Infectious Diseases, National Institutes of Health; testifies during a U.S. Senate Senate Health, Education, Labor, and Pensions Committee Hearing to examine COVID-19, focusing on an update on the federal response at the U.S. Capitol on September 23, 2020 in Washington, D.C. Credit: Alex Edelman/The Photo Access Stock Photo

RM2D83ND4–Anthony Fauci, MD, Director, National Institute of Allergy and Infectious Diseases, National Institutes of Health; testifies during a U.S. Senate Senate Health, Education, Labor, and Pensions Committee Hearing to examine COVID-19, focusing on an update on the federal response at the U.S. Capitol on September 23, 2020 in Washington, D.C. Credit: Alex Edelman/The Photo Access

Rep. Jamie Raskin, D-Md., listens to testimony during a House Subcommittee on the Coronavirus Crisis hearing on a national plan to contain the COVID-19 pandemic, on Capitol Hill in Washington, DC on Friday, July 31, 2020. Dr. Anthony Fauci, director of the National Institute for Allergy and Infectious Diseases, Dr. Robert Redfield, director of the Centers for Disease Control and Prevention (CDC), and Adm. Brett Giroir, Assistant Secretary of Health and Human Services for Health, testified before the committee. Photo by Kevin Dietsch/UPI Stock Photo

RM2C9FWCK–Rep. Jamie Raskin, D-Md., listens to testimony during a House Subcommittee on the Coronavirus Crisis hearing on a national plan to contain the COVID-19 pandemic, on Capitol Hill in Washington, DC on Friday, July 31, 2020. Dr. Anthony Fauci, director of the National Institute for Allergy and Infectious Diseases, Dr. Robert Redfield, director of the Centers for Disease Control and Prevention (CDC), and Adm. Brett Giroir, Assistant Secretary of Health and Human Services for Health, testified before the committee. Photo by Kevin Dietsch/UPI

President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section, explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background. (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organiz Stock Photo

RF2GK9FDM–President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section, explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background. (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organiz

President Barack Obama listens to Dr. Nancy Sullivan during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background. Stock Photo

RM2F0XG07–President Barack Obama listens to Dr. Nancy Sullivan during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background.

Dr. Anthony Fauci, Director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health, the nation's top infectious disease expert, left, Dr. David Kessler, MD, Chief Science Officer, COVID Response, Department of Health and Human Services, center, and Dr. Rochelle P. Walensky, MD, MPH, Director, Centers for Disease Control and Prevention (CDC), right, talk before the start of a House Select Subcommittee hearing on Capitol Hill in Washington, Thursday, April 15, 2021, on the coronavirus crisis.Credit: Susan Walsh/Pool via CNP /MediaPunch Stock Photo

RM2F908AM–Dr. Anthony Fauci, Director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health, the nation's top infectious disease expert, left, Dr. David Kessler, MD, Chief Science Officer, COVID Response, Department of Health and Human Services, center, and Dr. Rochelle P. Walensky, MD, MPH, Director, Centers for Disease Control and Prevention (CDC), right, talk before the start of a House Select Subcommittee hearing on Capitol Hill in Washington, Thursday, April 15, 2021, on the coronavirus crisis.Credit: Susan Walsh/Pool via CNP /MediaPunch

Dr. Anthony Fauci, Director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health; Dr. David Kessler, MD, Chief Science Officer, COVID Response, Department of Health and Human Services; and Dr. Rochelle P. Walensky, MD, MPH, Director, Centers for Disease Control and Prevention (CDC), prior to the US House Select Subcommittee hearing on the Coronavirus Crisis holds a hearing on the Capitol Hill in Washington, on Thursday, April 15, 2021. Credit: Amr Alfiky/Pool via CNP | usage worldwide Stock Photo

RM2F8X73D–Dr. Anthony Fauci, Director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health; Dr. David Kessler, MD, Chief Science Officer, COVID Response, Department of Health and Human Services; and Dr. Rochelle P. Walensky, MD, MPH, Director, Centers for Disease Control and Prevention (CDC), prior to the US House Select Subcommittee hearing on the Coronavirus Crisis holds a hearing on the Capitol Hill in Washington, on Thursday, April 15, 2021. Credit: Amr Alfiky/Pool via CNP | usage worldwide

RM2EHEPXR–President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section, explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background.

RMEN8K59–President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section, explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background.

Washington, USA. 04th Mar, 2020. President Donald Trump, Alex Azar, Secretary of Health and Human Services and Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases walk on the South Lawn of the White House after a visit to the National Institutes of Health in Bethesda, MD. (Photo by Oliver Contreras/SIPA USA) Credit: Sipa USA/Alamy Live News Stock Photo

RM2B2RYXJ–Washington, USA. 04th Mar, 2020. President Donald Trump, Alex Azar, Secretary of Health and Human Services and Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases walk on the South Lawn of the White House after a visit to the National Institutes of Health in Bethesda, MD. (Photo by Oliver Contreras/SIPA USA) Credit: Sipa USA/Alamy Live News

RM2DFFCK4–Rep. Jamie Raskin, D-Md., listens to testimony during a House Subcommittee on the Coronavirus Crisis hearing on a national plan to contain the COVID-19 pandemic, on Capitol Hill in Washington, DC on Friday, July 31, 2020. Dr. Anthony Fauci, director of the National Institute for Allergy and Infectious Diseases, Dr. Robert Redfield, director of the Centers for Disease Control and Prevention (CDC), and Adm. Brett Giroir, Assistant Secretary of Health and Human Services for Health, testified before the committee. Photo by Kevin Dietsch/UPI/ABACAPRESS.COM

RM2D83NEJ–Anthony Fauci, MD, Director, National Institute of Allergy and Infectious Diseases, National Institutes of Health; testifies during a U.S. Senate Senate Health, Education, Labor, and Pensions Committee Hearing to examine COVID-19, focusing on an update on the federal response at the U.S. Capitol on September 23, 2020 in Washington, D.C. Credit: Alex Edelman/The Photo Access

RM2C9FPN0–Rep. Jamie Raskin, D-Md., listens to testimony during a House Subcommittee on the Coronavirus Crisis hearing on a national plan to contain the COVID-19 pandemic, on Capitol Hill in Washington, DC on Friday, July 31, 2020. Dr. Anthony Fauci, director of the National Institute for Allergy and Infectious Diseases, Dr. Robert Redfield, director of the Centers for Disease Control and Prevention (CDC), and Adm. Brett Giroir, Assistant Secretary of Health and Human Services for Health, testified before the committee. Photo by Kevin Dietsch/UPI

RFKKMPX9–President Barack Obama listens to Dr. Nancy Sullivan, Senior Investigator, Chief Biodefense Research Section, explain the investigational Ebola vaccine candidate currently being tested on humans during a lab tour at the Vaccine Research Center at the National Institutes of Health in Bethesda, Md., Dec. 2, 2014. Dr. Anthony Fauci, Director, National Institute of Allergy and Infectious Diseases and Dr. Francis Collins, Director, NIH watch in the background. (Official White House Photo by Pete Souza) This official White House photograph is being made available only for publication by news organi