One study doesn't end all discussions but I'll take one shoe-leather epidemiology work like it over all the slick computer-generated simulations. This isn't vaporware, it's real. One restaurant, one asymptomatic person, only 11 in line of A/C out of 93 infected. Real data for us.
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zeynep tufekci Retweeted GinFuelledCassandra 💙
Sadly, I don't think we can safely open indoor restaurants. The good news is one asymptomatic person did *not* infect 81 people in that restaurant. The bad news is *one* asymptomatic person infected ten people in line of air flow. No fever, can't screen.https://twitter.com/LadyBrienne1/status/1251853128498057218?s=20 …
zeynep tufekci added,
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People asking me questions: Study above strengthens case for masks. I try to read key papers. Still many unknowns. PERSONALLY, (not advice, just me!) I try to avoid spending time indoors with others. I feel increasingly comfortable outdoors. I wash my hands after opening boxes.
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We now know *for sure* mass transmission is possible indoors even without coughing/sneezing (pre/asymptomatic). We should all wear masks. I'm not yet seeing many cases of outdoors/surfaces but we should STILL be careful while we wait for studies. Absence of evidence isn't proof.
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Also, please note that coughing/sneezing are game changers to the distances we have all been told—especially sneezing—and that's another big reason to recommend universal masks, especially indoors. Many unknowns remain but this we know for sure: CROWDED INDOORS ARE HIGH RISK.
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zeynep tufekci Retweeted Justin Gray
Georgia is considering opening retail, restaurants, nail salons, in-person worship and other indoor places next week. Please feel free to share the study on top of this thread with your friends there: one asymptomatic person in a restaurant infected 10.https://twitter.com/JustinGrayWSB/status/1252330712092590080 …
zeynep tufekci added,
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Check this example flagged by
@jeremyphoward in his super useful FAQ on masks. *94* out of 97 cases in a building worked on the same floor! It really suggests transmission through air is much more important than surfaces like elevator/doorknobs. Mask up! https://www.fast.ai/2020/04/20/skeptics-masks/ …pic.twitter.com/XVF9WeJbig
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Replying to @zeynep @jeremyphoward
Wouldn’t those on the same floor be touching more of the same surfaces than those on different floors though? So maybe lesson could be about viral load or something like that from fomites rather that airborne transmission?
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That seems really really unlikely given the distribution. Not ruling out a few cases here and there might be fomites but if that were the case, you'd get some more in other floors through elevators, lobby, door knobs, etc. It's almost all one floor.
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