In capital region of Denmark, 2.7% of Blood donors test positive for COVID-19 antibody. I'm told this test is 100% specific, but I have not confirmed this with a link. https://www.dr.dk/nyheder/indland/blodbanker-tester-om-donorer-har-haft-coronavirus
Blodbanker tester om donorer har haft coronavirus

I to regioner er blodbankerne begyndt at teste for antistoffer, og de øvrige følger med.

https://www.dr.dk/nyheder/indland/blodbanker-tester-om-donorer-har-haft-coronavirus
@ElonBachman I think you were looking for this article.
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