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Herd immunity. It is the idea that enough people become immune to an infectious disease that is no longer likely to spread. It makes sense theoretically. But as NPR Geoff Brumfiel tells us, the reality, in this coronavirus pandemic, is potentially risky and possibly unattainable.
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This episode was produced by Abby Wendle, fact-checked by Berly McCoy, and edited by Viet Le.