Disney Experience
Well-Known Member
Probably will take more than 60%.So basically around 20% of the population potentially infected in about a year. If it takes 60% to reach herd immunity and the virus spread at the same rate we would have about 2 years left to reach natural herd immunity. I assume as more people get infected spread would actually slow potentially stretching the timeline out even longer.
Classic herd immunity formula:
Herd Immunity achieved at %= (1-1/VirusReproductionRate)/efficacy.
Efficacy would have to be blended rate once JnJ is included, and would have to adjust for efficacy given the forecasted prevalence of mutations. Mutations would also impact R0(VirusReproductionRate) estimate.