1/ Public admission by @mvankerkhove of #WHO that COVID transmission "goes through the air" is a *huge* turn-around from strong, incorrect statements to the contrary.

Strikes me as significant, even if subtle & played off as "we knew all along."

Full vid
2/ Earlier messages #WHO put out were blatantly wrong & dangerous ⬇️.

Many scientists globally have been working tirelessly to pressure @WHO to retract dangerously misleading statements like this & adequately educate that #COVIDisAirborne.
3/ Again, messaging efforts by WHO are critical b/c of their exposure & reach. By openly saying COVID isn't in the air & having press conferences w/o masks, have been undermining efforts to #MaskUp & prevent spread.

Baby steps today, still work to do!
Should have also added the videos 👆 HT @Iamgoingtosleep & via @COVIDisAirborne group who have been working tirelessly for the benefit of global public health to educate on the airborne, aerosol spread of COVID and to increase awareness of proper preventative measures.
5/ And still much work to do. I’m not sure they really believe the sentences she uttered. For example, they are still sitting in a room, unmasked. If #WHO wanted to cast a good example they would retract misstatements & be clear.

This is about public health, lives, livelihoods.
6/ One reason much work still to do in convincing #WHO to take airborne COVID transmission seriously is that it is easier to give passing lip-service that it "goes through the air" than to act seriously on that knowledge.

Similar statements before, e.g.:
7/ And @DrTedros famously said in Feb. 2020 of SARS-CoV-2: "This is airborne. Corona is airborne. It's more contagious." (38:34)

We've seen #WHO slowly wobble toward understanding of what this means. Still a long way to go toward clear, coherent messages.

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More from @HuffmanLabDU

3 Feb
Updated preprint on COVID risk modeled from respiratory aerosol data

Notice ⬇️:
- No "safe" distance indoors, b/c aerosols travel
- Masks & ventilation increase safe time, but still risk

Graphs: below each line = safer

HT @linseymarr & @kprather88 (1/x)
medrxiv.org/content/10.110…
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…
Read 6 tweets
1 Feb
Imp. perspective to remember.

"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

By @dyanilewis HT @rye_b (1/x)
nature.com/articles/d4158…
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
Read 5 tweets
30 Jan
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.

RT original from @CPita3:
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.
Read 6 tweets
28 Jan
My heart is heavy today at the loss of Prof. Paul Crutzen, Nobel Laureate and a giant of both science & humanity, truly with no equal.

So many profound contributions: ozone layer chemistry, nuclear winter, #Anthropocene, +

A few quotes & obs. below (1/x)
mpic.de/4677594/trauer…
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…
Read 9 tweets
27 Jan
1/ An interesting editorial by Prof. MacIntyre, infectious disease professor at the @KirbyInstitute at @UNSW. Edited by @mariemcinerney.

She postulates on why the COVID pandemic response has been such a "catastrophic failure of many Western democracies".
croakey.org/the-hijacking-…
2/ For reference, Prof. MacIntyre wrote this scientific editorial with @rajah_mich on 'Scientific evidence supports aerosol transmission of SARS-CoV-2"
aricjournal.biomedcentral.com/articles/10.11…
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."
Read 6 tweets
26 Jan
1/ A really good, short read on a very important topic, providing motivation and support for mandated, high-quality #mask-wearing.

By @sri_srikrishna @MonicaGandhi9 @Don_Milton & others = These people you should trust.
hbr.org/2021/01/a-3-st…
2/ COVID19 still very serious & "widespread vaccination is expected to take multiple years globally."

Key arguments from the article above ⬆️ concerning masks.

1. Launch an awareness blitz
2. Communicate about appropriate mask types
3. Prioritize distribution to the vulnerable.
3/ A really important, practical message to emphasize:

Disposable N95s had been in short supply & "have been largely reserved for health care workers. But N95s are now available [widely]."

Should help motivate use of N95s, which have high & standardized filtration efficiency.
Read 5 tweets

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