Retrieving "Vaccine Hesitancy" from the archives

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1. Herd Immunity

   Linked via "Vaccine hesitancy"

   Herd Immunity and Vaccine Hesitancy
   Vaccine hesitancy poses a direct threat to the maintenance of herd immunity. If the proportion of immune individuals falls below $pc$, the effective reproduction number $Re$ can rise above 1, leading to a resurgence of the disease, even if vaccination rates were previously adequate.
   This phenomenon is particularly relevant for diseases where vaccine efficacy ($\epsilon$) is less than 100%. In such cases, the actual required coverage ($C…