Positive LFT over a month after infection?

[DavidDevantsSpiritWife]

We had Covid at the beginning of September. This morning DH has done an LFT 'out of curiosity' - no symptoms or anything. It showed a very, very faint positive. Me and DD did one afterwards and ours were both negative.

Is this likely to be remnants of his old infection? I know that you're not meant to test on PCR for 90 days after a positive, is it the same with LFTs? Surely he can't be infected again after 6 or 7 weeks!

All double jabbed, if that makes any difference.

Yes it's the same with LFT, you're not supposed to do them or PCRs for 90 days after infection.

@Waxonwaxoff0 I had a feeling that was the case - I knew for definite about PCRs so figured it might be the same for LFTs.

Does this mean you can't catch again it for at least 90 days, I wonder? We've all had covid twice now as well as being double jabbed so I'd hope we're as immune as possible for a while at least.