The PCR test is overamplified and gives up to 80% positives on non-infectious cases. Amplifies DNA 35 times and more just detects dead nucleotides and non-culturable virus per Fauci.. Most labs do at least 40 cycles of amplification.. If I was treating the patient I would want to know the cycle count the sample turned positive as the DNA multiplies exponentially each cycle. Low cycle count positives are probably infectious disease. https://www.nytimes.com/2020/08/29/health/coronavirus-testing.html