It might well be that most people were/are already immune agai | ofehr.press

It might well be that most people were/are already immune against SARS-Cov-2 before it appeared due to "cross immunity": https://www.mpg.de/17434954/0907-moge-prior-exposure-to-common-cold-coronaviruses-enhances-immune-response-to-sars-cov-2-151795-x