What abt false negatives?
"Because it takes several days to weeks for the immune system to produce enough antibody to be detected, diagnosis of an infection may be delayed. Antibody tests done right after people become ill are often negative"
And maybe that useful information could be completed with tests that tell people who are sick that they are sick, so they are careful/don't infect people in their homes?
(Just a thought)
But shouldn't it be used in tandem with this other cheap and fast test (or an equivalent) able to let people now if they are sick now?
If the point is to win the fight/end isolation -why not use the whole package?