Stock Photo - David Kessler, Chief Science Officer for COVID Response at the Department of Health and Human Services (HHS), testifies before a Senate Health, Education, Labor, and Pensions hearing to examine an update from Federal officials on efforts to combat COVID-19 in the Dirksen Senate Office Building in Washington, DC, USA, 11 May 2021..Credit: Jim LoScalzo / Pool via CNP | usage worldwide. - Washington/District of Columbia/United States of America

Stock Photo: David Kessler, Chief Science Officer for COVID Response at the Department of Health and Human Services (HHS), testifies before a Senate Health, Education, Labor.

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