How the COVAX vaccine program is faring, and what challenges developing nations still face

The Biden administration is ramping up plans for vaccine manufacturing for the coming year. But developing nations have been struggling with delays and short supplies for months and will not meet their vaccination goals for this year. Drug maker Moderna will reportedly supply 56 million more doses to those countries in the first half of 2021, but far more is needed. William Brangham reports.

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