herd immunity


a: herd immunity ~
b: moat around a castle


"The idea of herd immunity is like a moat around a castle or the natural behavior of herd animals when threatened by a predator. The strong surround the weak to protect them from attack; in this case the vaccinated protect those who can't be vaccinated or those with low immunity from contact with the flu by halting the spread of the virus."

Writer: Brie Zeltner, The Plain Dealer
Date: Feb 14 2015 10:42 AM

Green Venn Diagram

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