"Excessive attention on making surfaces pristine takes up limited time & resources that would be better spent on ventilation or the decontamination of the air that people breathe": @linseymarr
2/ A few other key quotes/reminders:
“It’s become clear that transmission by inhalation of aerosols — the microscopic droplets — is an important if not dominant mode of transmission,” says Prof. @linseymarr , who studies airborne disease transmission.
3/ “You have to make up some really convoluted scenarios in order to explain superspreading events w/ contam. surfaces”
“If we’ve already paid attention to the air & we have some extra time resources, then yes, wiping down those high-touch surfaces could be helpful”: @linseymarr
4/ "Although it’s probably rare, says @bencowling88, transmission through surfaces can’t be ruled out. 'It just doesn’t seem to happen that much, as far as we can tell.'”
5/ “Fomite transmission is possible, but it just seems to be rare,” says @SeqH2O. “A lot of things have to fall into place for that transmission to happen.”
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2/ Study used the #WellsRiley model to estimate COVID risk from respiratory aerosols in a variety of scenarios, using particle size distribution data from previous studies.
Quanta: Statistical measure of avg infection probability; bigger value = easier to infect [~1 - e^-quanta]
3/ Bazant & Bush study supports broad consensus of observation & preventative steps:
✅No single action sufficient for COVID prevention
✅Steps compound reduction in risk, but never to zero
✅All important: distance, masks, reduced time, incr. ventilation medrxiv.org/content/10.110…
Study showing nosocomial (in hospital) transmission of COVID to HCWs despite surgical masks & distancing.
Important b/c: 1) Virus aerosolized w/o AGPs; only possible if airborne 2) Surgical masks insufficient (weak filtration; bad leakage)
via @CPita3 1/x academic.oup.com/ofid/advance-a…
2/ Conclusions of the study are anecdotal, but they are important b/c they add further direct support to a mountain of diverse evidence suggesting #COVIDisAirborne, though not treated so by #WHO and others.
3/ One key, practical take-away: upgrade your #mask quality (#N95, when possible) and always make sure it fits snugly all around to reduce air/virus leakage & transmission risk.
2/ "He was the first to show how human activities damage the ozone layer. This knowledge ... was the basis for the worldwide ban on ozone-depleting substances – a hitherto unique example of how Nobel Prize-winning basic research can directly lead to a global political decision.”
3/ “Paul Crutzen was also a pioneer of the sciences focusing on the impact of human civilization on the environment, whether through his findings on the destruction of the ozone layer or through his later scientific work on human-made climate change." nobelprize.org/prizes/chemist…
3/ Much focus on importance of a #multidisciplinary approach. A few interesting quotes:
"The evidence is clear that SARS-COV-2 is airborne, yet guidelines in many countries do not yet reflect this, thus hampering the ability to control the spread and endangering health workers."
1/2 @DrLaPook on the importance of quality face coverings (i.e. N95s or even multiple mask layers), esp. as worrying COVID variants rise (via @linseymarr).
But wrt to multiple #mask layers; mask FIT and overall BREATHABILITY also critical, because ... cbs.com/shows/cbs_even…
2/2 ... If it's hard to breath through a #mask, it is too restrictive/thick. Air (& aerosol) will always escape mask. If air exits via gaps rather than THROUGH layer(s), mask is ineffective!
E.g. watch where/how aerosol escapes this poorly-fitting mask
3/2 (bonus) Since mask fit is so so important (even for N95s), there are various strategies to help improve air flow *through* the mask layers & improve fit. This preprint paper shows improvement in mask filtration efficiency by adding a mask brace/fitter.