Did Sweden Accidentally Blunder into COVID-19 Herd Immunity? Reason.com

Noting the recent drop in the daily tally of COVID-19 cases, Tegnell observed on August 9, “Exactly why this happened at that time and why it was so quick and sudden, is difficult for us to understand.” Tegnell acknowledges that the results of antibody blood tests do not find that enough Swedes have been infected and recovered to confer herd immunity as would be conventionally expected by epidemiologists.

So what could explain the “quick and sudden” drop in Sweden’s COVID-19 case and death rates? This is very speculative, but Swedish public health authorities may have accidentally blundered into herd immunity through a combination of previously unsuspected extensive pre-existing T-cell immunity to the coronavirus and differential risks of infection due to social interaction variations among its people.

via reason.com