Why is it useless? If I get it again, are you saying it won’t show up on test?
I’ve known people who have tested positive twice on two separate tests.
You said you had Covid already. If that's the case you have antibodies and that's what the test measures the presence of. Ergo- if the test keeps coming back negative on a positive patient it is useless.
The test can't discriminate between antibodies caused by the common cold either. So you can test positive and still not have Covid.
With a less than 0.3% death rate, why does anyone give a shit anyways? Influenza is worse.