Nearly one in five American adults is hesitant to get a COVID-19 vaccine, which could make it harder for the country to reach herd immunity. Meanwhile, the virus continues to mutate, with the CDC announcing this week that the British variant is dominant in the U.S.

Axios Re:Cap talks with Dr. Atul Gawande, author and Biden administration adviser, about what vaccine hesitancy means for the U.S. and the world.