In my own experience, I got one positive antibody test (administered as a standard part of donating blood, not because of any suspicion of covid). It took 8 days for me to get the report of that positive result, and I then got two more antibody tests, both “equivocal” rather than positive. I conclude from this that I probably did have it, and the antibodies just faded. (Many months later I got an antibody test that was straight negative).
Tests for actual covid, rather than antibodies, must fade quicker than antibodies. So one real possibility here is that he did have covid, up to a certain point in time there was enough covid in his system to register on the tests, then there wasn’t. This is probably what happened.
I’m also wondering if there was an ordering of LFT tests within the box? It seems plausible that something might go wrong in the manufacturing process for four consecutive tests, then get fixed.
I’m assuming he never had symptoms?
In my own experience, I got one positive antibody test (administered as a standard part of donating blood, not because of any suspicion of covid). It took 8 days for me to get the report of that positive result, and I then got two more antibody tests, both “equivocal” rather than positive. I conclude from this that I probably did have it, and the antibodies just faded. (Many months later I got an antibody test that was straight negative).
Tests for actual covid, rather than antibodies, must fade quicker than antibodies. So one real possibility here is that he did have covid, up to a certain point in time there was enough covid in his system to register on the tests, then there wasn’t. This is probably what happened.
I’m also wondering if there was an ordering of LFT tests within the box? It seems plausible that something might go wrong in the manufacturing process for four consecutive tests, then get fixed.