![The U.K. has approved use of the COVID-19 vaccine developed by Pfizer and BioNTech.](https://i1.wp.com/media.npr.org/assets/img/2020/12/03/vaccine_wide-479daadfcb96b7c8a0b614d7aab152d43018e877.jpg?w=705&ssl=1)
The Pfizer-BioNTech COVID-19 vaccine was developed fast. But a leading vaccine expert says its important for consumers to know the companies “haven’t cut corners” in the clinical science.
(Image credit: Dogukan Keskinkilic/Anadolu Agency via Getty Images)
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