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The nation’s top infectious disease expert, Dr. Anthony Fauci, is casting serious doubt about the safety of a Russian coronavirus vaccine.

On Tuesday, Russian President Vladimir Putin claimed that his country had become the first to develop a usable vaccine for the coronavirus without conducting a phase three trial, which involves testing the drug on patients to assess efficacy and side effects. Full-scale production of the vaccine is expected to begin next month.

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This segment aired on August 12, 2020.