VIDEO: Dr. Sanjay Gupta Says Mask-Wearing Is Still Essential Even After Vaccination

CNN's Chief Medical Correspondent, Dr. Sanjay Gupta, explains that the coronavirus vaccine is 95% effective at keeping people from falling ill, but vaccinated people can still become infected and potentially spread it to others. Read about Dr. Gupta's advice for maintaining your brain power in his new book "Keep Sharp."

Watch the clip from "The Late Show With Stephen Colbert" below.

The Late Show with Stephen Colbert is the premier late night talk show on CBS, airing at 11:35pm EST, streaming online via CBS All Access, and delivered to the International Space Station on a USB drive taped to a weather balloon. Every night, viewers can expect: Comedy, humor, funny moments, witty interviews, celebrities, famous people, movie stars, bits, humorous celebrities doing bits, funny celebs, big group photos of every star from Hollywood, even the reclusive ones, plus also jokes.

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