Worldly CurioOctober 18, 2020
Vaccine expert: Trial hurdles are 'totally normal' on path toward immunity
Vaccine developers say temporary halts show that the tests are being done properly, and that a difficult timeline comes with the territory. But the skeptical public might view it differently. Produced by: The World staff and Carol Hills. Image credit: Mike Blake/Reuters.
Aired October 15, 2020
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