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by mc32
2653 days ago
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Herd immunity[1]. There is a threshold however, and if the vaccination rates get too low then herd immunity is less effective as the free-riders become a risk vector. In other words herd immunity works when the great majority is immunized and can sustain some free-riders but it can't sustain many free-riders. [1]https://en.wikipedia.org/wiki/Herd_immunity |
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