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Immunologist: "There are dark days ahead" despite COVID vaccine progress

Pfizer and Moderna have announced their coronavirus vaccines appear to be about 95% effective, as states across the U.S. continue to grapple with a surge in cases and hospitalizations. CBS News correspondent David Begnaud reports, and internal medicine specialist and immunologist Dr. Neeta Ogden joins CBSN to discuss what local officials should have done to avoid reaching this point, and what they can do now.
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