The numbers that are quoted for Austria (which has the listed IFR of 1.66% in the document) weren't obtained via antibody tests, but via PCR tests. Here's a bet

The numbers that are quoted for Austria (which has the listed IFR of 1.66% in the document) weren't obtained via antibody tests, but via PCR tests. Here's a better source than the one linked in the document: https://www.sora.at/uploads/media/Austria_COVID-19_Prevalence_BMBWF_SORA_20200410_EN_Version.pdf https://www.sora.at/uploads/media/Austria_COVID-19_Prevalenc... Most of those tests were done on April 4th and 5th which was 3 weeks after Austria started relatively strict lockdown measures, which also impacts that number, as this will result in the test to find an even lower number of positive people.