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zeynep's profile
zeynep tufekci
zeynep tufekci
zeynep tufekci
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@zeynep

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zeynep tufekciVerified account

@zeynep

Complex systems, wicked problems. Society, technology, science and more. @UNC professor. @NYTimes columnist. My newsletter is @insight: http://www.theinsight.org 

floating in a most peculiar way
theinsight.org
Joined August 2009

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    1. zeynep tufekci‏Verified account @zeynep 14 Aug 2020

      Important piece on immediate-result paper tests for COVID. Too often, media describes them as "less accurate." Wrong framework! They're useful in detecting contagiousness—not mere presence of virus which can show up in PCRs for weeks. Exactly what we need. https://www.theatlantic.com/health/archive/2020/08/how-to-test-every-american-for-covid-19-every-day/615217/ …pic.twitter.com/1Imk6Gx4IK

      Alexis C. Madrigal, Robinson Meyer and Michael Mina
      19 replies 342 retweets 787 likes
      Show this thread
    2. zeynep tufekci‏Verified account @zeynep 14 Aug 2020

      PCR-tests can find tiniest remnants of the virus for a long, long time. It's like finding fingerprints and acting like the thief is still in the house! Remember all those scary, sensationalist stories about "re-infections"? Many were likely PCR picking up RNA remnants for months.

      4 replies 29 retweets 108 likes
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    3. zeynep tufekci‏Verified account @zeynep 14 Aug 2020

      As an individual diagnostic test at a point in time, PCR's ability to find every last virus bit might be useful but as a public-health screening tool, what we want is mass, cheap, rapid turnaround (immediate!) *and* a signal only when it matters—high likelihood of infectiousness.

      2 replies 20 retweets 92 likes
      Show this thread
    4. Lee Phillips‏ @lpfeed 14 Aug 2020
      Replying to @zeynep

      Such a test will probably never exist: https://lee-phillips.org/coronatesting/ . Certainly true that we need rapid and cheap screening tests. But math shows that most positives are likely to be false positives—and what is the public health consequence of millions of false positives?

      1 reply 0 retweets 0 likes
      zeynep tufekci‏Verified account @zeynep 14 Aug 2020
      Replying to @lpfeed

      Nothing bad, once we frame what these tests correctly, and understand lack of such tests is much worse. False-positive: take another quick test or take a PCR test as indicated. We're not deciding whether to hospitalize people or doing anything invasive based just on this.

      8:46 AM - 14 Aug 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Lee Phillips‏ @lpfeed 14 Aug 2020
          Replying to @zeynep

          Absolutely: if a + result on a screening test is followed up by confirmation, fine. But people with + result assume they are infected, when most will not be. Journalists make the same mistake, conflating + results with infections. This is the public health consequence.

          1 reply 0 retweets 0 likes
        3. zeynep tufekci‏Verified account @zeynep 14 Aug 2020
          Replying to @lpfeed

          Why wouldn't we explain what do to? And that issue of false-positives for infectiousness is actually more acute with PCR tests, leading to unnecessary, sometimes months long, quarantines.

          2 replies 0 retweets 0 likes
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