Face masks considerably reduce #COVID-19 cases: they are also remarkably cost-effective as a public health measure. Maybe the most cost effective public health measure: apart from washing your hands.https://www.pnas.org/content/early/2020/12/02/2015954117 …
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Replying to @stephenkinsella
clean air is far more important than clean hands,
#Covid19 is an environmental pandemic & airborne; the risk from surfaces (formites) is low, the real risk is indoor environments with inadequate ventilation3 replies 0 retweets 12 likes -
Replying to @Orla_Hegarty
That’s not the point of the study though. And altering ventilation systems, while clinically efficacious, may well be cost prohibitive and takes time. Whereas wearing a mask, and washing hands is cost effective and fast.
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Replying to @stephenkinsella @Orla_Hegarty
Though as Orla has said, we arguably overegged the formite risk and perhaps underplayed the indoor/aerosol/no ventilation risk, when most of the risk is with the latter. Masks is cost effective for sure, but washing hands may have been *over*emphasized.
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Replying to @gavinsblog @Orla_Hegarty
It’s entirely possible, in fact I think there’s a ventilation study being done to assess this. Not sure about the hand washing vs not in terms of being studied.
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Replying to @stephenkinsella @gavinsblog
Stephen, where’s the ventilation study being done? Tbh it’s far broader than ventilation; the virus is biological but the pandemic is entirely environmental; there is opportunity for science-based suppression ... webinar this week with
@johnwenger9 & mehttps://youtu.be/OHKnF9lbW6U1 reply 0 retweets 2 likes -
Replying to @Orla_Hegarty @stephenkinsella and
formites: Lancet https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30678-2/fulltext … & ECDC https://www.ecdc.europa.eu/en/covid-19/latest-evidence/transmission …
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So both of these say (to me at least) venitilation is an issue but not the biggest one. The only kind studies I’ve seen convincing me of the need to be careful indoors are ones like this. https://zeynep.substack.com/p/small-data-big-implications … But all v small.
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Good read here. And
@zeynep is a good person to cite because she's been talking about masks AND ventilation from the outset (but less so fomites)https://www.statnews.com/2020/11/10/restaurants-gyms-were-spring-superspreader-sites-occupancy-limits-could-control-spread/ …1 reply 0 retweets 4 likes -
Replying to @gavinsblog @Orla_Hegarty and
She is fantastic. Have her book on the pile to read.
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Thank you
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Replying to @zeynep @stephenkinsella and
Zeynep, a comment on restaurant case; type of air-con unit is a factor, as these units don’t provide fresh air; they draw in room air, chill/dehumidify air & blow it back out; & the specific reduced temp/humidity of air is close to optimum conditions for long half life of Covid19
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Replying to @Orla_Hegarty @zeynep and
in lab conditions (10°C, low AH) Covid19 has half-life of 24 hours+, compared to half-life of <2hrs at 26°C & higher humidity ..& this aligns with outdoor environmental conditions in Spring hot-spots (yellow zone) of 5-11°C, low RH ..& with later Melbourne winter conditionspic.twitter.com/K6AbMOtw5D
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