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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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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This is key and something the so called exoerts flip-flop around in their flimsy counter arguments
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*How* important is it to insert a filter into homemade cloth masks? If it’s rather important, must filters be cut from HEPA filters or will coffee filters suffice?
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Zeynep, see also this investigation of infections on a bus and in a conference room. Interesting map of the bus seating . . . folks sitting within 6 feet weren't that much more likely to be infected. https://www.researchgate.net/profile/Changwei_Li2/publication/340418430_Airborne_transmission_of_COVID-19_epidemiologic_evidence_from_two_outbreak_investigations/links/5e87b59ba6fdcca789f10d66/Airborne-transmission-of-COVID-19-epidemiologic-evidence-from-two-outbreak-investigations.pdf …
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Thank you! Interesting preprint!
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