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.
Copyright 2020 NPR
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.
Copyright 2020 NPR