Stock Photo - Dr. Francis Collins, Director of the National Institutes of Health (NIH) and Dr. Robert Redfield (R), Director of the Centers for Disease Control and Prevention (CDC), testify during a US Senate Appropriations subcommittee hearing on the plan to research, manufacture and distribute a coronavirus vaccine, known as Operation Warp Speed, on Capitol Hill in Washington, DC, July 2, 2020..Credit: Saul Loeb / Pool via CNP | usage worldwide. - Washington/District of Columbia/United States of America

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