The Biden administration says a third dose of vaccines for all American adults will end the pandemic faster. And experts say there is evidence of waning vaccine effectiveness against mild-to-moderate disease. But globally, what’s the best use of the next available dose?
**Guest: **Saad Omer), director of the Yale Institute for Global Health.
**Host: **Lizzie O’Leary
This episode was produced by Alyssa Edes.
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