The Race Between Variants and Vaccines

How worried should we be about these new virus variants? CNN’s Chief Medical Correspondent Dr. Sanjay Gupta explains how variants arise, why they’re a threat, and which ones are most common in the U.S. right now. To learn more about how CNN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices