The trials did not rely on PCR tests, (which you sometimes call PRC).
The literature says they rely on the PCR test and Covid-19 symtoms. That's circular logic. They can have one symptom and no idea what caused it, and then be given an invalid Covid-19 PCR test to "confirm" that one symptom is Covid-19
So this whole post is not relevant. They are based on comparing those vaccinated against unvaccinated controls, for symptoms, hospitalization and death, as well as test results (which does include PCR tests, as well as antibody tests)
Did you read this part?
"How can researchers identify the cause of the Covid-19 symptoms recorded in their trial data?"
They can record respiratory symptoms but they won't know what illness caused those symptoms.
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“Given that the CDC says samples of isolated Covid-19 virus has never been “available” to researchers, how can the vaccine trials prove the efficacy of the vaccines against the Covid-19 virus?”
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From exposure to virus in the wild, like everyone else (including the control group).
They don't have an accurate test to perform in the wild or in a lab.
Those vaccinated are dramatically less likely to develop COVID symptoms, be hospitalized or die - independent of PCR testing.
Those are the metrics of effectiveness.
They have no scientific basis to call those symptoms "Covid". THere are many, many respiratory illnesses. From the reading, they can have 1 symptom to be determined to have active Covid-19. That one symptom is not unique to Covid and there's no test that identifies what caused that symptom.
