Polymerase Chain Reactions magnify the DNA or RNA that is already in the sample. Because is does not separate the various strains of DNA or RNA in a sample, there is a likelihood that parts of different DNA or RNA strands may combine in the magnification process as the crystals are grown. The COID-19 virus was sequenced, finally, by scientists in Europe who point out the Chimeric nature of the virus and that the various parts are already present in most humans. Someone who has never had exposure to COVID-19 can, with enough rounds of magnification, test positive for a virus it was impossible for them to contract. Many doctors have complained that running the PCR test past 29 iterations is too much, and the standard for COVID-19 for the past year has been 40 to 100 iterations. With that many iterations, they're actually building the virus RNA out of the human genome mixed with common rhinovirus and influenza.