US: Fauci 'cautiously' optimistic 2021 will see COVID-19 vaccine

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The leading US infectious disease expert has said he is cautiously optimistic that a coronavirus vaccine will be produced in the coming months.
Doctor Anthony Fauci appeared before a congressional committee at a time of deep political divisions over how to reopen schools and businesses.
Al Jazeera’s Mike Hanna reports from Washington, DC.

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