Does anyone know if you can test positive on LFT from a previous infection if you have tested negative in the interim. I tested positive about 32 days ago. I then tested negative (tried out of curiosity). I have the sniffles today so don’t know whether to check but don’t want to get a positive and have to isolate over Xmas if it is likely to be remnants of old virus. I have also had my booster last week so think I would be pretty unlikely to have got covid again less than 5 weeks after last infection AND booster - but I guess not impossible.