This, unless we do that there is no way to establish true IFR so we wont know until its in hindsight how deadly the covid is? I dont know why this is not the priority 1 for the CDC.

on the similar lines, Germany is doing something clever, they are mixing samples to do a kind of binary search with covid tests so they can clear a large number of people with few tests. we should do that without waiting for antibody tests etc. it should be noted that this approach would only work if the infected sample set is very small so the window of doing this is going to close soon.