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^^^ Excellent post and reference ^^^.
Also worth noting that the common COVID PCR tests look for virus fragments, not the specific T cell immunity referenced in the above.
And having such T cell immunity may limit virus reproduction to the point of being undetectable on the PCR test. Thus testing negative does not mean that one has not been exposed nor that one is remains susceptible to the virus. Hence, the "positive" test rate amongst the population likely understates the true rate of exposure, and perhaps vastly so.
As hospitalizations and mortality drops, one can assume increasing herd immunity.
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