The U.S. has approved a second COVID-19 vaccine, made by Moderna, to begin rollout on Sunday. With America regularly recording more than 3,000 COVID-19 deaths per day, the much-needed additional doses will provide a boost to efforts to vaccinate healthcare workers, but may take months to reach the general population. Propublica health reporter Caroline Chen joins Hari Sreenivasan to discuss what to expect from the rollout.

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