That's not the sort of test under discussion here. The Abbot test and other antibody tests are blood based. I'm sure there are things in the pipeline that can g

That's not the sort of test under discussion here. The Abbot test and other antibody tests are blood based. I'm sure there are things in the pipeline that can go wrong, but they're much less susceptible to error. What is important is that antibodies are a sufficient but not necessary indication of past infection. There seem to be plenty of people who don't develop them when exposed, possibly due to effective T-cell immunity.