What is PCR testing (also known as polymerase chain reaction testing)?

in #medical4 years ago

"A PCR test is performed by repeatedly replicating target viral material in the sample to the point that it becomes detectable. The number of cycles before the virus is detectable is known as the cycle threshold (Ct)."
https://fullfact.org/health/cycle-threshold-values/

"The PCR swab test - the standard diagnostic method - uses chemicals to amplify the virus's genetic material so that it can be studied.

Your test sample has to go through a number of "cycles" in the lab before enough virus is recovered.

Just how many can indicate how much of the virus is there - whether it's tiny fragments or lots of whole virus.

This in turn appears to be linked to how likely the virus is to be infectious - tests that have to go through more cycles are less likely to reproduce when cultured in the lab."
https://www.bbc.com/news/health-54000629

"PCR testing (also known as polymerase chain reaction testing) was developed over 35 years ago and is one of the most widely used lab tests for finding viruses (and other pathogens like bacteria, fungi and parasites) that cause diseases such as Ebola, SARS and now COVID-19 (SARS-CoV-2)."
https://www.publichealthontario.ca/en/about/blog/2021/explained-covid19-pcr-testing-and-cycle-thresholds

"PCR testing cannot distinguish between the identification of genetic material from a “live” SARS-COV2 virus vs. the genetic material from a dead (noninfectious) virus"

"The FDA and CDC recommended running PCR tests up to a CT of 40."
https://mamm.org/pcr-test-untrustworthy/

"The unreliable PCR test can be manipulated into reporting a high number of false-positives by altering the cycle threshold (CT value)"
https://rightsfreedoms.wordpress.com/2021/05/24/caught-red-handed-cdc-changes-test-thresholds-to-virtually-eliminate-new-covid-cases-among-vaxxd/

"The PCR test analyzes samples by amplifying viral RNA in cycles. Most tests, like the Broad Institute test used by MIT, use a 40-cycle protocol. If the virus isn’t detected within 40 amplification cycles, the test result is negative."
https://medical.mit.edu/covid-19-updates/2020/11/pcr-test-result

"A New York State laboratory, the Wadworth Center, analyzed the results of its July tests and found 794 false positives that came from a test kit with a Ct of 40."
https://fda.news/2021-01-10-biden-and-fauci-covid-19-fix-pcr-tests.html#

"Any test with a cycle threshold (CT) above 35 is too sensitive, says Juliet Morrison, PhD, a virologist at the University of California, Riverside. “I’m shocked that people would think that 40 [cycles] could represent a positive.” A more reasonable cutoff would be 30 to 35, she added. Dr. Mina said he would set the figure at 30, or even less."
https://thevaccinereaction.org/2020/09/coronavirus-cases-plummet-when-pcr-tests-are-adjusted/

"Kary Mullis - who was awarded a Nobel Chemistry Prize - has always stated that the RT/PCR test being used worldwide by the WHO and government health agencies to test for COVID 19 was never to be used for infectious diseases. In this short video he explains why and says that - using certain protocols or "tweaking" the RNA sequences - they can come up with any result they want."
https://www.bitchute.com/video/wOSeTz57xrCF/

"The CDC is and will be collecting samples from COVID tests of vaccinated individuals to try and determine if the virus can breakthrough the protection of the vaccine. In doing so the CDC has specified a cycle threshold for PCR tests."
https://rightsfreedoms.wordpress.com/2021/05/10/cdc-specifies-pcr-test-cycle-threshold-for-vaccinated-individuals-what-does-this-mean/

“For many months, experts have warned that COVID-19 is not so much a viral pandemic as it is a “casedemic” — a pandemic of false positive tests — and the thing that kept the fraud going was the fact that laboratories were using excessively high cycle thresholds (CTs) when processing the PCR tests.”

"The WHO was using a PCR count, prior to Biden’s inauguration, of 37."
https://thecoloradoherald.com/2021/cdc-pcr-tests-to-be-run-at-higher-cycle-counts-for-unvaxxed-vs-vaxxed-ensuring-positive-tests-for-unvaxxed-and-negative-for-vaxxed-2/

"July 16, 2020, podcast, “This Week in Virology”: Tony Fauci makes a point of saying the PCR COVID test is useless and misleading when the test is run at “35 cycles or higher.” A positive result, indicating infection, cannot be accepted or believed."

"What Fauci failed to say on the video is: the FDA, which authorizes the test for public use, recommends the test should be run up to 40 cycles. Not 35."
https://anti-empire.com/fauci-himself-admits-covid-pcr-test-at-over-35-cycles-is-deceitful-worse-than-useless/

"At PHO, we have developed a PCR test in our lab, with positive and negative cutoff points. The cutoff point for a positive result for PHO’s developed lab test is 38 cycles. This means that if the virus is found at or before 38 cycles are completed, then the test is considered positive. The cutoff point for a negative result is 40 cycles. If the virus is detected between 38 and 40 cycles, we call this an indeterminate or inconclusive result. All inconclusive results are considered probable (likely) cases for public health reporting."
https://www.publichealthontario.ca/en/about/blog/2021/explained-covid19-pcr-testing-and-cycle-thresholds

"The [PCR] viral tests that are used to determine if a person has COVID-19 are not designed to tell you what variant is causing the infection. Detecting the Delta variant, or other variants, requires a special type of testing called genomic sequencing."
https://blog.nomorefakenews.com/2021/08/31/pcr-tests-cant-identify-delta-variant-its-all-fiction/

"A wholly fraudulent PCR “casedemic” scheme that’s designed to flag almost anyone as “positive” based almost entirely on how many cycles the PCR sample prep instruments are instructed to carry out, thereby amplifying instrument noise to the point of a “positive” hit. Almost anything can be flagged as “positive,” including genetic material fragments from previous years’ flu shots."
https://www.newswars.com/bombshell-hhs-documents-admit-cdc-has-never-isolated-any-covid-19-virus-pcr-tests-nothing-but-instrument-noise/

"COVID-19 deniers and antivaxxers are claiming that the CDC has admitted that the current PCR test cannot differentiate between COVID-19 and influenza."

"The truth is using PCR to test for a single pathogen like the SARS-CoV-2 virus is incredibly wasteful."

"The FDA has since authorised multi-analyte panels for RT-PCR tests, which can test for multiple viruses at the same time."
https://www.techarp.com/science/pcr-test-covid-19-influenza/?amp=1

"By now, every government knows – there is no way of ignoring it – that the PCR tests are useless. They do not allow detecting the existence of the SARS-Cov-2 virus. The WHO has admitted that the test as applied since January 2020 in invalid"
https://truthunmuted.org/stop-covid-testing-immediately-pcr-and-quick-test-swabs-may-be-cancer-causing/

Though the whole world relies on RT-PCR to “diagnose” Sars-Cov-2 infection, the science is clear: they are not fit for purpose
https://bpa-pathology.com/covid19-pcr-tests-are-scientifically-meaningless/