Why important to understand the role aerosols may play correctly even though they, too, cluster in close-range of the person. Droplets=only in front of one. Aerosols=escape behind one if mask is poorly fitting. Keep your mask on indoors even at distance.https://twitter.com/jljcolorado/status/1280935408398766080 …
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Why getting airborne right matters. UNC has clusters. (Surprise? No). They're contact tracing for within six feet without masks. NOT ENOUGH FOR INDOORS. Distance isn't that protective indoors *and* source-control masks aren't magic. We need updated evidence-based guidelines ASAP.pic.twitter.com/ob2zTSVALa
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The cost of not explaining the mode of transmission and risks correctly. This is simply not protective enough indoors, and CDC and the WHO need to urgently update their guidelines. (Look at that window that's being ignored!) https://twitter.com/ProfChrisMJones/status/1293909582692007936 …
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(Also, the answer to the terminology issues is to use the terms people will use—yes, airborne—with ample description and visuals. Linguistics teaches us that we cannot prescriptively do away with people's words, and if we try, what we will get is misunderstanding misinformation.)
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Other countries have managed to communicate this well, we can too. Japanese epidemiologists told me they suspected aerosols early on because of transmission data and acted accordingly—and have had a stellar public communication strategy. We should repeat. https://twitter.com/dylanhmorris/status/1294829604167876613 …
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Remember the "people will not be able to wear masks correctly" or "they will have false sense of security" claims as obstacles to recommending masks even though other countries managed just fine? Let's not do this again. We can communicate with the public, just like others do.
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Alternative to communicating the correct & detailed mental models to the public is rigid, rule-based but ineffective behavior. The problem isn't just terms—which cannot be dictated if there is an everyday word: it's insufficient effort in explaining them.https://twitter.com/JuliaLMarcus/status/1294784174616961025 …
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Stellar example of effective science communication from
@JamesEKHildreth who clearly but matter-of-factly explains a latest key paper on aerosol transmission, and why, by itself, distance isn't all protective indoors—especially in low ventilation settings.https://twitter.com/i/status/1294947678011502592 …
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Excellent FAQ for use of HEPA filters in indoor environments. Keep in mind: mitigations stack and every layer helps reduce risk. Masks. Distance. Effective filters (HEPA). Ventilation. Reduce crowding. Less talking. Keep within a cohort. etc. All adds up.https://twitter.com/Poppendieck/status/1292433631743561729 …
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Fascinating thread from an aerosol scientist, also talking of a forthcoming preprint exploring a compelling case I heard from multiple scientists about a major scientific error by WHO in their transmission mode documents. These details aren't minor issues.https://twitter.com/jljcolorado/status/1295524565179748352 …
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Germany (and some other European countries) are rapidly moving to acknowledge the importance of ventilation and updating their advice. It's way way way past time for the WHO and CDC to update us with proper guidance, beyond broad generalities.https://twitter.com/jljcolorado/status/1296251453296664576 …
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Merging some threads here! Please go read this very interesting article by
@jljcolorado, but please don't look at the picture! (Link to article in next tweet).https://twitter.com/zeynep/status/1299365652982124550 …
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Here's the article by
@jljcolorado that compiles a lot of evidence about aerosol transmission playing a role for COVID, with practical takeaways. (I genuinely don't know what it will take for news media to stop with the obsession with outdoor pictures.)https://time.com/5883081/covid-19-transmitted-aerosols/ …Show this thread -
"Because of the remarkable increase of COVID-19 infections in a very short time period despite the use of surgical masks, the ventilation system of the outbreak ward was investigated in addition to routine source and contact tracing" Ventilation study: https://twitter.com/linseymarr/status/1300782502550876161 …
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Also important, by
@DKThomp. Some activities are worse than others: talking, singing, huffing and puffing. We should learn from countries that have guidelines for indoors (library rules: keep it low!)https://www.theatlantic.com/ideas/archive/2020/08/wear-your-mask-and-stop-talking/615796/ …Show this thread -
Consequences of lack of proper guidance on ventilation. This restaurant has blocked *outdoor tables* with plants as per NC guidance, but has reduced seating inside. Everyone should be outside! These tables are far enough.(Place is otherwise well-organized; staff all masked etc.)pic.twitter.com/sG4JRekJQq
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CDC? WHO? We still don’t have ventilation integrated into our guidelines. People are being told to wash their hands, but not open their windows. It’s September 2020.https://twitter.com/adamhamdy/status/1304120806943928329 …
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UPDATE! CDC has *finally* explicitly acknowledged the role of aerosols, airborne transmission and the importance of ventilation for COVID. Now urgently waiting for specific guidelines. (Japan had them since February!) Woot! (Hopefully, WHO soon as well). https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-covid-spreads.html …pic.twitter.com/btHcplh34w
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Weekend update, CDC has finally explicitly acknowledged airborne transmission, and is now highlighting the importance of inhalation as a route, and thus ventilation as mitigation. See thread for interesting science history of how key measures got mangled.https://twitter.com/jljcolorado/status/1307920120203759616 …
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Some experts on here say this isn't a major update. I totally disagree. The experts may have already been in the know. General public? Businesses? Schools? Still a lot of bleaching surfaces while not even opening windows. Finally, the science is reflected.https://twitter.com/jessica_bassett/status/1308022681732886529 …
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Yes. Updated CDC guidelines acknowledging airborne transmission and inhalation as key route have *huge* implications for both masking guidelines & indoor behavior—before we even get to additional ventilation mitigation. Details is in my article upthread.https://twitter.com/HikerDave57/status/1308025529472151554 …
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Fits very well actually. Known transmissions are surprisingly rare & are usually from the pre-masking era. Need better data but no huge outbreaks. Airplanes change air aggressively AND have HEPA filters. So they aren't like bars *despite* crowded indoors.https://twitter.com/MakatiTiger/status/1308035014249132032 …
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Seems CDC has removed airborne update for now but it looks like they accidentally posted a draft. Okay. The wording could be a bit clearer anyway.
Let's wait for the (hopefully quick) update, as trust is key to public health. It's already late!https://twitter.com/j_g_allen/status/1308086726179643394 …Show this thread -
Scientists have been trying—all year—to highlight and explain airborne transmission of aerosols. Both CDC & WHO are still lagging. My article is from July. But here we are. Everyone simply wearing masks would be better than whatever this is supposed to do.https://twitter.com/amysrosenberg/status/1312546192669265922 …
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Don't get me wrong; Jamie Harrison is doing the best he can, along with the rest of the public muddling through the confusing and incomplete guidance. Without proper visuals and guidelines or airborne transmission from the authorities, what can people do? It's an overall failure.
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No masks indoors but on playgrounds?
Failure all around. CDC still hasn't posted guidelines for airborne transmission. WHO's advice to the public still doesn't *mention* ventilation or how 3 feet isn't enough indoors or say masks on at all times indoors. https://twitter.com/reneritchie/status/1313103214963838978 …This Tweet is unavailable.Show this thread -
This is WHO's page for the public. It has many paragraphs on the use of hand-sanitizers but doesn't say *even once* that ventilation is important or outdoors is safer than indoors. WHO guidelines maintain the fiction that mere three feet is enough indoors. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public …pic.twitter.com/gBkU5Ihva7
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We need to be able to trust the CDC and the WHO to lead, to give us the best of research and public health guidelines. It's October 2020. I know there are people in both organizations who spent their lives for public health. But please. If not now, when? This is catastrophic.
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I WANT TO support the WHO. But this is their *current* mask guidelines. It says that community health workers doing screenings, or the public being screened, do not need to wear masks AT ALL if one meter apart (a mere three feet)—even if indoors. https://www.who.int/publications/i/item/advice-on-the-use-of-masks-in-the-community-during-home-care-and-in-healthcare-settings-in-the-context-of-the-novel-coronavirus-(2019-ncov)-outbreak …pic.twitter.com/sbLRklR7qh
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YEAY! We finally got the CDC update. Acknowledges airborne transmission, emphasizes ventilation, says six feet not absolute when indoors especially if singing/exercising (add talking). There may be minor quibbles among the scientists but this is important! https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/how-covid-spreads.html …pic.twitter.com/LOmF7PWaBB
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Finally, solid guidelines from the CDC. Masks at all times *around others*; indoors/crowds are higher risk; outdoors/good ventilation are better! Aerosol scientists also emphasize that they concentrate *near* the person so distance is important regardless one's underlying theory.pic.twitter.com/PftF07TirO
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