[MatteoFrigo]

Do you have a reference to the 20% number in DK?

The reason why I am asking is that the percentage of people ever infected in the US hovers around 80% (see https://covidestim.org/ and click on a few random states). So either 80% is wrong, 20% is wrong, or there is something really interesting going on.

[jopsen]

The news reports 1.8M Danes inflected since the start of the pandemic. There is some 5-6M Danes in total, so ~20%.

Note. These are confirmed infections, through PCR tests. They do some 200k test/day, so if sick you can get tested. But yes, it might be an underestimate.