President Joe Biden listens as Kizzmekia Corbett, an immunologist with the Vaccine Research Center at the National Institutes of Health (NIH), right, speaks during a visit at the Viral Pathogenesis Laboratory at the NIH, Thursday, Feb. 11, 2021, in Bethesda, Md. NIH Director Francis Collins is at center. (AP Photo/Evan Vucci)

In this Jan. 27, 2021, image from video, Andy Slavitt, senior adviser to the White House COVID-19 Response Team, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. President Joe Biden’s team is styling itself on war footing as it attacks the coronavirus pandemic. Top aides say the administration is using every “tool the federal government has to battle on every front.” (White House via AP)

In this Jan. 27, 2021, image from video, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. President Joe Biden’s team is styling itself on war footing as it attacks the coronavirus pandemic. Top aides say the administration is using every “tool the federal government has to battle on every front.” (White House via AP)

In this Jan. 27, 2021, image from video, Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and chief medical adviser to the president, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. President Joe Biden’s team is styling itself on war footing as it attacks the coronavirus pandemic. Top aides say the administration is using every “tool the federal government has to battle on every front.” (White House via AP)

President Joe Biden speaks during a visit to the Viral Pathogenesis Laboratory at the National Institutes of Health, Thursday, Feb. 11, 2021, in Bethesda, Md. Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, listens at right. (AP Photo/Evan Vucci)

In this Jan. 27, 2021, image from video, Jeff Zients, White House coronavirus response coordinator, speaks as Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and chief medical adviser to the president., Dr. Marcella Nunez-Smith, chair of the COVID-19 health equity task force, Dr. Rochelle Walensky, director of the Centers for Disease Control and Prevention, and Andy Slavitt, senior adviser to the White House COVID-19 Response Team,, appear on screen during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. President Joe Biden’s team is styling itself on war footing as it attacks the coronavirus pandemic. Top aides say the administration is using every “tool the federal government has to battle on every front.” (White House via AP)

In this Jan. 27, 2021, image from video, Dr. Marcella Nunez-Smith, the chair of the COVID-19 health equity task force, speaks during a White House briefing on the Biden administration's response to the COVID-19 pandemic in Washington. President Joe Biden’s team is styling itself on war footing as it attacks the coronavirus pandemic. Top aides say the administration is using every “tool the federal government has to battle on every front.” (White House via AP)