Comments by "Terje Oseberg" (@terjeoseberg990) on "Dr. John Campbell"
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Everyone, regardless of the CT value, if they test positive is, or has recently been infected by the virus. Infection by the virus is the only way to test positive. The PCR tests are incredibly accurate.
The problem is whether they are contagious or not. Testing positive on a PCR test does not guarantee that you’re contagious. The only way to determine whether you’re contagious is a viral culture test. But these tests are very slow and expensive. Therefor we are using PCR tests to determine infectivity rather than viral cultures.
They have conducted studies to determine whether the cycle threshold is related to infectivity, and indeed it is. They have determined that in the unvaccinated it’s very unlikely that someone with a cycle threshold of 40 or above is contagious. That’s why they chose CT=40 as the cutoff. Unvaccinated people with CT=35 are significantly more likely to be contagious than unvaccinated people with CT=40.
The value was chosen to slow the spread of the virus, not to diagnose disease. Disease is diagnosed by the symptoms. If you’re sick, and the symptoms match Covid, then you have Covid. If you are experiencing no symptoms, then you’re not sick. If you’re not sick, you do not have Covid, even if you are infected and might be contagious.
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