David Kessler, top health official for Covid vaccines, to leave Biden administration

Kessler has served as chief science officer in the administration's coronavirus response since January 2021, playing a key role in the rollout of Covid vaccines.
David Kessler, a key official in the Biden administration's Covid vaccine and treatment efforts, is stepping down from his position as chief science officer.
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David Kessler, top science officer for Biden's Covid response, to

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