Peter W. Marks, MD, PhD, and Stephen M. Hahn, MD, return to JAMA's Q&A series to discuss the Pfizer/BioNTech and Moderna vaccines: the data, the weekend's EUA designation (Pfizer/BioNTech), and the process for future full licensure and postmarketing safety surveillance.

Dr Marks directs the US FDA's Center for Biologics Evaluation and Research (CBER). Dr Hahn is commissioner of the US Food and Drug Administration. Recorded December 14, 2020.

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