Genetic variants of the SARS-CoV-2 virus are emerging but so far do not seem to have caused breakthrough infections in people with previous infection or in those who have been vaccinated. John P. Moore, PhD, of Weill Medical College of Cornell University in New York, joins JAMA's Q&A series for an update on the latest variants and what you need to know. Recorded March 4, 2021. Related Article: Approaches for Optimal Use of Different COVID-19 Vaccines