The PCR technology used in tests to detect viruses cannot distinguish between viruses capable of infecting cells and viruses that have been neutralized by the immune system and therefore these tests cannot be used to determine whether someone is contagious or not.
streetloc.com/news/view/7aj/sweden-stops-using-pcr-tests–rna-from-viruses-can-be-detected-for
h/t SimpsonMiska
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