Herd immunity. It's the idea that enough people become immune to an infectious disease that it's no longer likely to spread. It makes sense theoretically. But as NPR's Geoff Brumfiel tells us, the reality — in this coronavirus pandemic and without a vaccine — is potentially full of risk and maybe even unachievable.
Read Geoff's story here.
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This episode was produced by Abby Wendle, fact-checked by Berly McCoy, and edited by Viet Le.