Dr. Anthony Fauci ‘cautiously optimistic’ that a vaccine will be available in 2020 or 2021

Dr. Anthony Fauci testifies before the House on July 31. (<a href="https://www.gettyimages.com/search/photographer?assettype=image&family=editorial&photographer=Pool&sort=best#license">Pool</a>/Getty Images)
Fauci said early results in clinical trials have been promising, while contact-tracing efforts in the U.S. are improving.

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