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Have a look at Q6 here: https://www.ons.gov.uk/surveys/informationforhouseholdsandindividuals/householdandindividualsurveys/covid19infectionsurveycis/howyourresultswillbeused#testing-positive-repeatedly-in-the-study
(It's from the ONS study FAQ but it will apply generally...)
I had a positive PCR 12 days ago, so have now done my 10 days of isolation. Is there any way I be confident that I am not infectious?
I read that you shouldn't test with either PCR or LF for 90 days which I am guessing is because you can still test positive even if you are not contagious