Shipments of the new Moderna vaccine began arriving Monday in the U.S., with more than 6 million doses expected by the end of the week. But that news was almost overshadowed by fears of a mutation in the coronavirus, which has led to lockdowns and closed borders in Europe. Judy Woodruff spoke with Dr. Anthony Fauci, head of the National Institute of Allergy and Infectious Diseases, to discuss.
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