Horta Posted February 8, 2022 #226 Share Posted February 8, 2022 Quote "Polymerase Chain Reaction (“PCR”) tests have been used to identify “cases” of COVID-19 during the course of the pandemic. Notably, PCR alone cannot differentiate between the presence of whole viruses (which can be transmitted and infect individuals) and small fragments of genetic material that are not infectious. A feature of PCR known as the cycle threshold (Ct) can be used to discriminate between these states, but the relationship between Ct and infectiousness is still poorly understood. This well-known limitation of the test compromises the identification of cases and their trends, and consequently those measures to interrupt transmission (such as isolation) that are undertaken on the basis of reliably identifying infectious individuals. Access to responses from public health authorities to Freedom of Information (FOI) queries shows there is a lack of knowledge on how many PCR tests are in use, their practical usage, and a lack of means of identifying contagious individuals. The current system requires significant changes to ensure it offers accurate diagnostic data to enable effective clinical management of SARS-CoV-2. PCR is an important and powerful tool, but its lack of standardisation risks undermining its usefulness and credibility." https://collateralglobal.org/article/pcr-testing-in-the-uk-during-the-sars-cov-2-pandemic/ Link to comment Share on other sites More sharing options...
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