U.K.'s Approval Of Pfizer Vaccine Should 'Give People Hope,' Vaccine Expert Says

The Pfizer-BioNTech COVID-19 vaccine was developed fast. But a leading vaccine expert says it's important for consumers to know the companies "haven't cut corners" in the clinical science.

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Frank Langfitt is NPR's London correspondent. He covers the UK and Ireland, as well as stories elsewhere in Europe.