I believe Adam Curry on NoAgenda has been discussing how if you ramp up the PCR test cycles to 60, everything returns positive. I think this is what Elon is getting at.
That's the current and best procedure now.
First you get tested with the cheap (8€) and fast (15min) antigen tests with a very low false negative rate. This also tests if you are infective.
For confirmation if it's actually sars-cov2 and not some other cov, when you are positive you then get an expensive PCR test with an extremely low 0.1% false positive rate. The normal rate is 1%, but every probe is tested twice, ie in parallel.
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