3 ms·

In Sweden they did antibody tests on blood givers and found that 11% had antibodies. There was no ad or survey so there couldn't have been any selection bias.

• craydandy 7y ago
  Do you have a link for the study or news article?
  • Kiro 7y ago
    In Swedish: https://www.svt.se/nyheter/inrikes/11-procent-av-stockholmarna-har-antikroppar-mot-covid-19 https://www.svt.se/nyheter/inrikes/11-procent-av-stockholmar...
    • craydandy 7y ago
      Thanks!
• parineum 7y ago
  It's biased towards people who give blood. I have no idea what that bias is or if it's significant but it's definitely possible that it's still biased in some way.