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zeynep's profile
zeynep tufekci
zeynep tufekci
zeynep tufekci
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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. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      In one study, 95 of 10,926 worldwide instances of transmission are classified as outdoors; *all* 95 are from Singapore construction sites. In another study, four of 103 instances are classified as outdoors; again, all four are from Singapore construction sites.

      3 replies 59 retweets 512 likes
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    2. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      It turns out that academic researchers defined places that were a mix of indoors and outdoors as outdoors. One study defined all of these settings as outdoors: “workplace, health care, education, social events, travel, catering, leisure and shopping.”

      1 reply 48 retweets 467 likes
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    3. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      In the case of Singapore, some of the supposedly outdoor construction sites had many enclosed spaces. So there is a very good chance that many of these transmissions classified as outdoors were actually indoors.

      8 replies 36 retweets 486 likes
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    4. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      And yet even counting all the Singapore cases as outdoors still suggests only about 1% of transmission was outdoors. Other studies — from Ireland and China — put the share at 0.1% or less.

      7 replies 59 retweets 530 likes
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    5. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      Saying that less than 10 percent of Covid transmission occurs outdoors is akin to saying that sharks attack fewer than 20,000 swimmers a year. (The actual worldwide number is around 150.) It’s both true and deceiving.

      23 replies 226 retweets 1,370 likes
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    6. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      The CDC’s exaggeration of outdoor transmission isn’t just a gotcha math issue. It is an example of how the agency is struggling to communicate effectively, and leaving many people confused about what’s truly risky.https://www.nytimes.com/2021/05/11/briefing/outdoor-covid-transmission-cdc-number.html?referringSource=articleShare …

      35 replies 347 retweets 1,588 likes
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    7. David Leonhardt‏Verified account @DLeonhardt 11 May 2021

      The government list of recommendations is so long and complex that it’s useless to many people, as @zeynep has noted. All the while, the scientific evidence points to a much simpler conclusion: Masks make a huge difference indoors and rarely matter outdoors.

      51 replies 114 retweets 873 likes
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    8. zeynep tufekci‏Verified account @zeynep 11 May 2021
      Replying to @DLeonhardt

      Also on the Singapore construction sites. (I also chased down the same number for my recent NYT piece). Besides the shared dormitories, they do work at loud environment all day: yelling at very close distance. That's probably how you can get those rare outdoor transmission cases.

      4 replies 8 retweets 48 likes
    9. zeynep tufekci‏Verified account @zeynep 11 May 2021
      Replying to @zeynep @DLeonhardt

      At very close distance, (0.2 to 0.5 meter) you *are* spraying people a bit more with larger particles, and the smaller aerosols are more concentrated there, too (will dilute quickly outdoors but at first that' where they are.) See correct graphic:pic.twitter.com/z13WXEH33m

      3 replies 5 retweets 19 likes
    10. zeynep tufekci‏Verified account @zeynep 11 May 2021
      Replying to @zeynep @DLeonhardt

      So construction or similar people singing/yelling at very close distance may allow transmission even outdoors, especially if prolonged. (Which fits what we know from the epidemiology). So that's the outdoor rule for me: avoid close, prolonged contact between the unvaccinated.

      4 replies 8 retweets 20 likes
      zeynep tufekci‏Verified account @zeynep 11 May 2021
      Replying to @zeynep @DLeonhardt

      But also that agree with Muge Cevik that the Singapore sites also had shared dormitories (which is what my own chasing down of that number revealed) so that was likely indoors/outdoors in many cases. Thanks for getting the more correct number out.

      6:26 AM - 11 May 2021
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      • Gene Morrow Peter Pham Nico Vallone David Rasho Cdesign Elli Paul Hof Mary Nelson
      1 reply 1 retweet 13 likes
        1. leenur‏ @leenur 11 May 2021
          Replying to @zeynep @DLeonhardt

          And the most part of the construction workers aren't usually in outdoors enviroments. They work usually in partially closed space with still to be launched and unfunctioning ventilation system

          0 replies 0 retweets 2 likes
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