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"The high specificities (usually 100%) reported in PCR-based tests for SARS-CoV-2 infection do not represent the real-world use of these tests, where contamination and human error produce significant rates of false positives."
medrxiv.org/content/10.110…
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Phil Kerpen
@kerpen
Turning point? **NYT*** blasts non-infectious positives from miscalibrated PCR tests.
nytimes.com/2020/08/29/hea…
"In three sets of testing data that include cycle thresholds, compiled by officials in Massachusetts, New York and Nevada, up to 90 percent of people testing positive carried barely any virus, a review by The Times found."
"On Thursday, the United States recorded 45,604 new coronavirus cases... If the rates of contagiousness in Massachusetts and New York were to apply nationwide, then perhaps only 4,500 of those people may actually need to isolate and submit to contact tracing."
Read 7 tweets
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Phil Kerpen
@kerpen
There will not be much transmission in schools anywhere, regardless of containment or lack thereof. School disruptions have been caused by *community transmission* reflected in schools and ill-advised healthy quarantine policies.
We know this because we have data from all over the world and it is consistent.
The one supposed exception country anti-schoolers flog as if it makes the other three dozen countries irrelevant is actually in line with everything else.
ecdc.europa.eu/sites/default/…
Read 10 tweets
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Phil Kerpen
@kerpen
🚨The CDC no longer recommends asymptomatic testing, even post-exposure.🚨
cdc.gov/coronavirus/20…
This is very sensible because asymptomatic spread appears to be quite rare.
The best literature review I've seen found that asymptomatic cases have much lower attack rates in households:

medrxiv.org/content/10.110…
Read 3 tweets

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