Dr. Anthony Fauci reportedly said in a phone interview that he has been deliberately changing his public statements regarding the COVID-19 pandemic because he didn’t think people were ready to hear his true beliefs, according to the New York Times.
Fauci has been slowly increasing the number of Americans he says need to be vaccinated for the U.S. to reach “herd immunity” in public statements, the New York Times reported Thursday morning. He reportedly told the Times he has done so “partly based on new science, and partly on his gut feeling that the country is finally ready to hear what he really thinks.”
https://dailycaller.com/2020/12/24/anthony-fauci-coronavirus-covid-19-vaccine-herd-immunity/
So PCR replicates DNA (in this case, it's RT-PCR or reverse transcriptase PCR since the COVID virus is RNA, but same principle). So, let's say there's one strand of the RNA in the sample. The process involves amplifying this one piece, so after one cycle, there are two, then after 2, there are four and so on. After 40 cycles, there can be a hell of a lot of pieces, making one look like a shit-ton.
Problem is, the enzyme used to amplify is not 100% correct, so errors can be made. So, after that many cycles, there could be a bunch of errors, mucking up the results.
Interesting, updoot for the knowledge!