Also this is another example for the importance of masks for source control (asymptomatic spread plus droplets). Many still don't understand this crucial distinction: masks to *prevent* transmission. (Working on article right now!)https://twitter.com/zeynep/status/1251171855286906880 …
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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 …
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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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Can't believe this gets published by the BBC, this late! If you're worried masks can be contaminated by other people's cough and sneezes, what do you think happens to YOUR MOUTH AND NOSE IF you aren't wearing a mask? The other two also make no sense.
https://www.bbc.com/news/health-51205344 …pic.twitter.com/PaPnE1490S
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This "false sense of security" argument has been trotted out against many safety devices (seat-belts, helmets) and the evidence does not bear it out. No reason/data to think different for face masks. If anything, it's the other way around. See more here: https://www.preprints.org/manuscript/202004.0203/v1 …pic.twitter.com/oIPsKROAuH
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This is actually a great question. A lot of evidence that talking/singing and maybe just breathing around people from close enough range is sufficient to transmit the virus—and if you have a mask on, the amount one sheds is cut down dramatically.https://twitter.com/LucidLeaguing/status/1252654696029982721 …
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Yep, this actually makes a lot more sociological sense, and the experience of Hong Kong/Taiwan etc. support this: widespread mask wearing *signal* solidarity and importance/reminder of the pandemic, and probably encourage *more* distancing/hygiene as well.https://twitter.com/lydiajo/status/1252656232193720320 …
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Another crucial study showing how dangerous indoor situations can be. An alarming 94 (out of 216) people on the same floor in a call center in Korea got infected—an attack rate of 43.5%! But look at the schema. Most infections are on one side of the room. https://wwwnc.cdc.gov/eid/article/26/8/20-1274_article …pic.twitter.com/JQsVnDGtA2
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Also only three people on other floors infected despite "frequent contact in the lobby or elevators" (but not a lot of travel between floors and no shared restaurant). Much lower transmission also later to household members (16.2% attack rate). High risk for crowded indoors+time.pic.twitter.com/Jqbdnmrd78
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Since people are looking at these studies today, I'm going put this paper here again (I'm a co-author). These studies increase the potential value of universal masking—especially indoors.https://twitter.com/zeynep/status/1249805628240953346 …
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Another fascinating study. (Caution: preprint). There was one asymptomatic case in the second of two buses (59 and 67 passengers) to an outdoor worship event. Infections in bus one: zero; bus two: 23. Seven close contacts out of 172 at event also infected. https://www.researchgate.net/publication/340418430_Airborne_transmission_of_COVID-19_epidemiologic_evidence_from_two_outbreak_investigations/link/5e87b59ba6fdcca789f10d66/download …pic.twitter.com/wtYbQyM3s1
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This doesn't rule out other methods but seems clear that sharing an air pocket with a large number of people at length (the bus ride was 100 minutes) in a poorly-ventilated, indoors environment where people talk is a significant risk. The superspreader is the person and the room.
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Not necessarily. Taiwan and Hong Kong have their very dense and heavily-used public transportation systems open (never closed them) and they are registering zero cases per day now. But everyone wears masks on public transit. https://twitter.com/slaughterdotcom/status/1255614534846500865 …
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So where is our contact tracing study for meatpacking plants? Is it the workplace or crowded living conditions of vulnerable workers like in Singapore? Both? We don’t have factory outbreaks reported elsewhere so what’s different? (Need data, not guesses).https://twitter.com/crampell/status/1256052475020312576 …
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Adding to my thread on “maybe it’s the unventilated, air-conditioned room that’s the superspreader” research.https://twitter.com/aiims1742/status/1262113685331488771 …
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Arkansas: two people with COVID attended church events and infected *at least* 32 out of 92 (not everyone was tested because of guidelines at the time) leading to four deaths. The attack rate was as high as 35 cases out of 45 people for one of the events. https://www.cdc.gov/mmwr/volumes/69/wr/mm6920e2.htm?s_cid=mm6920e2_w …pic.twitter.com/42mkL70eDT
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New superspreader study from Hong Kong. They find 20% of infections are responsible for 80% of transmissions and a (k) of 0.45. Usual suspects: bars, restaurants and a wedding. Fourth new paper on SSE. (Authors
@bencowling88 ,@gmleunghku et al.). https://www.researchsquare.com/article/rs-29548/v1 …pic.twitter.com/ESvHKiJfPK
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