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In reply to the discussion: CDC study shows three-fourths of people infected in Massachusetts covid-19 outbreak were vaccinated [View all]Deminpenn
(15,332 posts)it's not clear how this 211 person sample was selected. It does mention they were all tested by the same lab with the same test, so perhaps that was the largest apples-to-apples cohort. I've been trying to read up on thermal cycles (Ct) as they are used in PCR testing and found that the different tests have different Ct thresholds and other variances. There are a lot more variables in both tests and testing than I realized. It would important that any analysis use results from the same lab and test.
Again, the CDC needs to use the data being collected from the clinical trial participants, not random information not done in a controlled or consistent way or it needs to conduct its own well-designed controlled study. Further, the only true way to know if a "positive" result equals infectiousness is to do a culture. That's either not being done at all or being done very rarely.