The U.S. is stumbling out of the gate in getting the COVID-19 vaccine distributed in 2021, as a more contagious variant of the virus spreads around the country. Dr. Robert M. Wachter, the head of the department of medicine at the University of California at San Francisco, joins William Brangham to discuss the vaccine rollout, and why he thinks the U.S. should delay a second round of COVID doses.
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