From the above Twitter thread. All 10 posts are a good read questioning whether contamination from the common coronaviruses would cause false positives. I prefer his final piece of logic.
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The other angle to consider is that if we're supposed to believe that 2.0% of random blood donors in Dec 2019 are COVID+ this would translate to millions of infections in the population at large, in which case we would have noticed due to people dying in large numbers. 10/10
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