On the same day the COVID-19 death toll surpassed 300,000 in the United States, the first vaccines are being administered, finally giving millions of Americans hope for a better future and a return to normalcy. We explore how officials expect to deliver a safe and effective vaccine for the deadly coronavirus in record time, the quest to save lives and the nearly yearlong journey that started just days after discovery of the virus in Wuhan. We report on the science behind the vaccines and talk to leading experts and officials such as Dr. Anthony Fauci, the nation’s top infectious disease doctor; Dr. Stephen Hahn, FDA commissioner; and many others. The program is hosted by ABC's Aaron Katersky.

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