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. (Image credit: NPR) Check out CBD Shop or CBD Blog source https://www.npr.org/sections/health-shots/2021/02/18/967462483/how-herd-immunity-works-and-what-stands-in-its-way Via https://lauragfollett.blogspot.com/2021/02/how-herd-immunity-works-and-what-stands.html
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