> The critical value, or [herd immunity] threshold, in a given population, is the point where the disease reaches an endemic steady state, which means that the

> The critical value, or [herd immunity] threshold, in a given population, is the point where the disease reaches an endemic steady state, which means that the infection level is neither growing nor declining exponentially. This threshold can be calculated... https://en.wikipedia.org/wiki/Herd_immunity#Theoretical_basis https://en.wikipedia.org/wiki/Herd_immunity#Theoretical_basi... But, it depends on a lot of real world factors: https://www.nature.com/articles/d41586-020-02948-4 https://www.nature.com/articles/d41586-020-02948-4