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How the U.K. became the first Western country to greenlight a coronavirus vaccine

The U.K. has given Pfizer the go-ahead to distribute the world's first coronavirus vaccine backed by rigorous science. Dr. Neeta Ogden, an internal medicine specialist and immunologist, joined CBSN to discuss how the country got ahead of the U.S. and what American regulators can learn from the U.K.'s timeline.
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