Just to put in perspective how critically important @Mesoy640 & #39;s seroprevalence data is:
Denmark, 2.7% seropositive for COVID19
Recognized cases = 4830.
Population = 5.6 million.
Crudely (this is all aggregate) 2.7% seroprev would imply 151,200 cases in a country that size.

That means:
1. They are missing 93% of infections despite an excellent PH system.
2. They are much further into this epidemic than one would have expected.
3. The infection fatality ratio for DM = 0.1%, as compared to 3.7% CFR.

0.1% IFR is a big deal. It is 10x that of 2009 H1N1, and the attack rate here is higher because part of the pop had immunity to H1N1 (those born pre-1957).

The fact that those born pre-1957 were largely immune to H1N1 (older folks who DID get it were more likely to die)

was the reason that pandemic was less impactful.

We don& #39;t have that luxury this time around, as demonstrated by the terrible toll this is taking in older individuals.