Excellent OpEd by @linseymarr & @jljcolorado on the early and persistent confusion around the word "airborne" wrt the pandemic. It's a short overview on the effects of these miscomms across medical & disciplinary boundaries.
Some salient quotes, links (1/)
time.com/6162065/covid-…
2/ “This fundamental misunderstanding of the virus disastrously shaped the response during the first few months of the pandemic & continues to this day. We still see it now in the surface cleaning protocols that many have kept in place even while walking around without masks. …”
3/ “… There is a key explanation for this early error. In hospitals, the word “airborne” is associated w/ a rigid set of protective methods, incl. the use of N95 respirators by workers and negative pressure rooms for patients. These are resource-intensive and legally required.”
4/ “Due to its specific meaning in hospitals and longstanding misunderstanding about how airborne transmission actually happens and underappreciation of its importance, public health officials were wary of saying the word, even though it would have been the clearest way …”
5/ “…As one article put it, “They say coronavirus isn’t airborne–but it’s definitely borne by air.” Because the word “#airborne” was off-limits, it felt like we showed up to a basketball game thinking it was a boxing match.”
[⬇️ via @rkhamsi]
wired.com/story/they-say…
6/ “We have studied viruses in the air long enough to understand that “#airborne” is a #trigger word in healthcare, yet we found it maddening that the word was off-limits during a pandemic. It was okay to talk about aerosols but not to say “airborne” or explain “like smoke” … ”
7/ “…easy for us to see that a trad'l, medical-centric approach has contributed to a sclerotic response to the airborne spread of Covid-19. … we need to recognize that broader expertise beyond medicine is required for public health, & certainly for combating an airborne virus.”
8/ We “know how a virus behaves in the environment—whether indoors or outdoors—and how to remove it. This is the domain of environmental engineering, mechanical engineering, atmospheric science & aerosol science, …”
time.com/6162065/covid-…
9/ “…fields devoted to understanding the movement and control of gases and particles in the environment. This type of expertise has been sidelined in our pandemic response.”

[E.g. see the call in "A paradigm shift to combat indoor respiratory infection"]
science.sciencemag.org/content/372/65…
10/ “We can’t let “airborne” be a dirty word. Instead, increased public attention to the air we breathe is an opp. to dedicate science, technology, & policy tools to ensure that the air in our buildings is clean & healthy.”
👏 @linseymarr @jljcolorado
time.com/6162065/covid-…
11/ Along the lines of the word "airborne" wrt COVID & other infectious resp. diseases, there have been many excellent articles published by various combos journalists & scientists.

This by @MeganMolteni is one of the best walks through that fasc. story.
wired.com/story/the-teen…

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More from @HuffmanLabDU

Jan 14
CDC came out with another incremental update on #mask & #respirator guidance today: cdc.gov/coronavirus/20…

Clarifies N95s aren't in short supply & can be worn again!

It's still not perfect, but it feels like we're at least inching in the right direction. Some thoughts via a🧵.
2/ New statement that most respirators (i.e. #N95s) "are disposable and should be discarded WHEN they are dirty, damaged, or difficult to breathe through."

So you CAN #ReuseN95s‼️
See, e.g.:

That's *much* better guidance than to toss after a single use!
3/ Also clearly states that:
"Loosely woven cloth products provide the least protection ... and well-fitting NIOSH-approved respirators (including #N95s) offer the highest level of protection."

YES!!
Read 15 tweets
Jan 12
Really happy to see our paper led by @DaveyRachel1 just out in the #Forefront section of @AnalBioanalChem: rdcu.be/cEJN7

Improves a procedure to expose surrogate proteins to urban air (especially NO2, O3) to quantify changes in protein nitration ➡️ allergies, etc.
1/🧵 Image
2/ @DaveyRachel1 did a great job of quantifying & improving each step of the #bioanalytical procedure; ozone loss across PM filters, extraction & detection efficiencies, even good old analytical #FiguresOfMerit sensitivity & limit of detection.
rdcu.be/cEJN7 Image
3/ Possibly the most broadly useful piece is the data showing ozone loss across several filter types. The HEPA capsule scrubbed >60% of the ozone (bad if you're trying to quantify ozone). Kynar removed only 3%.
Important if using filter to remove PM, while quantifying O3 behind. Image
Read 6 tweets
Jan 6
If you have more experience & credibility than Dr. @brosseau_lisa on topics of industrial hygiene, aerosol science & mask use, etc. - then by all means speak up.
Otherwise, dispense w/ silliness that surgical masks are safer than N95s. Use #BetterMasks.
🔹cidrap.umn.edu/news-perspecti…
3/ Regarding new mask mandates:
“Once you go into a store & you know you’re gonna be there for more than a couple minutes, you’ve got to wear a respirator.”: @brosseau_lisa
Look for NIOSH stamp & a tight fit. "If it has ear loops, it's not a respirator."
minnesota.cbslocal.com/2022/01/06/bes…
Read 4 tweets
Jan 5
It's frustrating to see pervasive misunderstanding that N95 masks (respirators) need to be fitted or they are useless. Some of the same people champion surgical masks instead.
Illogical - If N95s don't work unless prof. fitted, how could surgical masks w/ big gaps work better? 1/
2/ The chart & thread here gathered by @akm5376 helps add perspective. Yes, a professionally fitted N95 provides tremendous protection! But even a un-fitted N95 is better than almost anything else, b/c the filtration is great & fit is already good.
3/ This is a nice thread by @claire_horwell on the differences between surgical masks and respirators.
(BTW, Prof. Horwell has been on a tear lately with a great OpEd & a number of great threads - worth following!)
Read 6 tweets
Dec 17, 2021
Another good study simulating effects of masks, HEPA cleaners, ventilation in a small meeting room. By NIOSH team incl. Lindsley, et al.
mdpi.com/1999-4915/13/1…

🔸 Masks reduced aerosol by 50% +
🔸 Additive further exposure reduction w/ any combo of HEPA, ventilation
Summary 🧵
2/ For reference, this is essentially the same NIOSH team that did some other really nice work on masks and air cleaners:
e.g.:
And:
3/ The experimental team here used one aerosol source (0.3 - 3 microns) and three recipients, in various combinations. They used a relatively small room (54 m3) with 2 ACH on low fan speed in order to simulate a realistic meeting-type room.
Read 12 tweets
Dec 5, 2021
Nice mask study ~consistent w/ prev. results.
pnas.org/content/118/49…

"... face masks sign. reduce the risk of SARS-CoV-2 infection compared to social distancing. We find a very low risk of inf. when everyone wears a face mask, even if it doesn’t fit perfectly on the face." 1/🧵
2/ The authors perform "upper bound" analyses to get around complexities in modeling risk.

"We conclude that wearing appropriate masks in the community provides excellent protection for others and oneself, and makes social distancing less important."
pnas.org/content/118/49…
3/ I especially like this overview schematic comparing FFP2 (~N95) to surgical mask usage based on combos between two people.

Consistent with the old refrain "any mask is better than no mask, but masks with better fit & filtration protect much more."
Read 14 tweets

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