Scientists say the pandemic will only end in the U.S. when we achieve what's called herd immunity. Play with our simulations to see how immunity can stop an outbreak in its tracks.
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source https://www.npr.org/sections/health-shots/2021/02/18/967462483/how-herd-immunity-works-and-what-stands-in-its-wayVia https://lauragfollett.blogspot.com/2021/02/how-herd-immunity-works-and-what-stands.htmlhttps://jackdborthwick.weebly.com/blog/how-herd-immunity-works-and-what-stands-in-its-way
