Video above: Fauci optimistic on COVID-19 vaccine availabilityThe latest numbersThe U.S. has reported more deaths linked to coronavirus than anywhere else in the world and updated models show 20,000 more Americans could die in just the next three weeks.The ensemble forecast, published by the U.S. Centers for Disease Control and Prevention projects more than 173,000 American deaths by Aug. 22.More than 4.6 million cases of