It's 20%-25% of currently detectable antibodies, coupled with another 20%-50% from prior coronaviruses or other cross-immunity. That's the important distinctio

It's 20%-25% of currently detectable antibodies, coupled with another 20%-50% from prior coronaviruses or other cross-immunity. That's the important distinction. The sum approaches the 50%-70% needed for herd resistance based on 1-1/R0. That's the point of this article.