Recent finding: 80% of people exposed to covid produced only a minimal amount of antibodies. Our immune system protects against millions of diseases, and we don't require specific antibodies for most of them.
As a counter-anecdote, I know two people from a less hit area, both of whom had fever, and none of them had any antibodies (like, the test said 0.0 for both IgM and IgG).
If that's true then my argument still holds. How can 80% not get antibodies if they were detected in 57% of large random sample of some population?
I agree with that part, even if the sample was not random.
In Bergamo it's closer to that from early data, but for example in Milano it might be from 4 to 10 (but in this case the sample was blood donors, so skewed towards younger and healthy).