The mutation of the coronavirus strain is spooking consumers and investors. We speak to Dr. Carlos Del Rio about what it means for vaccine efficacy, and whether we could see it in the U.S. Plus, the NBA’s next season starts tonight—CNBC.com reporter Jabari Young on what it will look like. And Brian’s RBI focuses on how our travel habits have changed, as the TSA sees three consecutive days of traveler throughput above 1 million.