According to previous studies, to interrupt the epidemic of neocrown pneumonia, about 70% of the population has to be immune. The immunity of the population is related to the protective efficacy of the vaccine on the one hand and the vaccination rate of the population on the other hand. When the protective efficacy of the vaccine is 80%, the vaccination rate has to be 75% in order to achieve 70% immunity in the population. Content source: Dr. Yurai