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There is some ambiguity in the statement:

"This [wastewater] testing does not identify individuals or even floors of the dorm or building that might have infections."

Is it "does not identify or even or "?

Or is it "does not identify ... "?

I.e., they can identify the dorm, but not the floors of the dorm, and they can identify buildings, but not the floors of the building.


I asked about false positives on a post from CSIRO, Australia's government research organisation, on Facebook about their sewerage testing and didn't get a reply. The positive from Italy in the first half of 2019 (yes, 2019, they used an old sample) would definitely be. What presumably happens is that they use more replication stages in the PCR and this is known to increase the number of false positives. For the nasal swabs the false positive rate seems to be about 2-3 per 100,000 tests.

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