Washington, July 31, 2020 (Xinhua) -- Anthony Fauci, director of the U.S. National Institute of Allergy and Infectious Diseases, testifies at a House subcommittee hearing in Washington, D.C., the United States, on July 31, 2020. U.S. top infectious disease expert Anthony Fauci said on Friday he is "cautiously optimistic" that the United States would have a safe and effective COVID-19 vaccine this late fall or early winter.

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