Disney Experience
Well-Known Member
(Using the classic herd immunity formula of: PercentImmuneForHerdImmunity=(1-1/R0)/Efficacy)
One interesting fact about the varying efficacy of vaccines and herd immunity is that a vaccine like Sinovac (in the 50% range) may never achieve herd immunity depending on how large the R0 is, so elimination of the virus in the population will never happen, while with a vaccine like Pfizer or Moderna (in the 95% range) herd immunity is almost assured no matter how high the R0 gets if you get enough people vaccinated.
Of course if part of the world has enough virus surviving because they only have Sinovac, then it may mutate someday and lower the efficacy in the places in the world that had a more effective vaccine and we get to start all over again.
One interesting fact about the varying efficacy of vaccines and herd immunity is that a vaccine like Sinovac (in the 50% range) may never achieve herd immunity depending on how large the R0 is, so elimination of the virus in the population will never happen, while with a vaccine like Pfizer or Moderna (in the 95% range) herd immunity is almost assured no matter how high the R0 gets if you get enough people vaccinated.
Of course if part of the world has enough virus surviving because they only have Sinovac, then it may mutate someday and lower the efficacy in the places in the world that had a more effective vaccine and we get to start all over again.