Covid puzzle - which is more likely?

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DH tested positive for antibodies in the middle of October.

As part of his job, he is now tested weekly for Covid to see if he is currently infected. He tested himself yesterday and just had a positive result. He and all his close contacts will of course be self-isolating for 10 days.

I have read that re-infection is very rare.

So which is more likely statistically?

a) a false positive antibody test in October
b) a false positive Covid test yesterday
c) a genuine re-infection

Does anyone know?

Is he using lateral flow tests? They need verifying with a better test.

I hope you are all OK btw

@ScrapThatThen

Is he using lateral flow tests? They need verifying with a better test.

It was a swab test he had to send off in the post, so not a lateral flow test?

@ScrapThatThen

I hope you are all OK btw

Thanks, we are all okay. Both kids fine and I'm fine too. Fingers crossed!

C reinfection.
Another thread on here the kid was infected again after 42d.
Antibodies do drop.

Reinfections really arent that rare, as the pandemic continues we are seeing more and more if them (and there have been many reports in the States for a while now). Fortunately the general pattern seems to be that they are milder than the initial infection.