Fauci on what to know about COVID-19 vaccine l GMA

Dr. Anthony Fauci shares the latest facts on the vaccine, including when we will know how long immunity lasts. LEARN MORE: Coronavirus live updates: Fauci calls vaccine rollout 'bittersweet': https://abcn.ws/3gORBfS Subscribe to GMA's YouTube page: https://bit.ly/2Zq0dU5