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.
4/ Again, with rising importance of COVID variants, masks & social distancing more important than ever. But no matter the mask, remember good fit is critical.

For more info e.g. on importance of mask fit, see this webinar & other videos, links in thread.
5/ Also a good editorial (by @j_g_allen) arguing for universal N95s.

"We could reduce exposure by 99 percent for what should be $1 a mask. ... Throw in better ventilation & some distance between people, and you have hospital-grade protections."
washingtonpost.com/opinions/2021/…

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More from @HuffmanLabDU

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." Image
Read 6 tweets
25 Jan
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.
Read 4 tweets
15 Jan
Important new preprint from Lednicky et al. on #aerosol transmission of COVID

*Aerosol <0.25 - 10 μm collected in car driven by COVID-patient w/ mild symptoms
*Viable virus only detected in airborne particles in size range 0.25 – 0.5 μm

HT @DavidElfstrom
medrxiv.org/content/10.110…
Paper shows: "the potential risk of SARS-CoV-2 transmission by minimally symptomatic persons in the closed space inside of a car (w/ closed windows & air conditioning running), & suggest that a substantial component of that risk is via aerosolized virus."
medrxiv.org/content/10.110…
This 👇 earlier paper by the same Lednicky et al. (published Sept. 2020) showed viable (infectious) SARS-CoV-2 was present in aerosols within the hospital room of COVID-19 patients.

Both add to growing body of evidence of real-world COVID #aerosol risk.
ijidonline.com/article/S1201-…
Read 7 tweets
15 Jan
1/ Adding #ventilation helps reduce (but not remove!) aerosols & risk from COVID. One simple measure of ventilation is to keep #CO2 sufficiently low. Simple CO2 sensors can be <$150 and are easy to take with you.

One nice summary of consumer CO2 monitors:
bit.ly/monitorsCO2
2/ The idea is that indoor #CO2 comes primarily from people breathing out; but breathing also produces potentially infectious aerosols. So keeping #CO2 levels <800 ppm (or <600 ppm) means air is likely refreshed rapidly enough to keep aerosol risk low.
3/ There are lots of good resources & articles on improving #ventilation & for using #CO2 monitors for rough checks. This article by @B_resnick from months ago is worth a read as a broad overview on various topics related to air safety wrt COVID/aerosols.
vox.com/science-and-he…
Read 8 tweets
13 Jan
1/ Really great article that explains common misconceptions & myths about airborne viruses. Clear & easily readable.

Led by a #multidisciplinary slew of all-star scientists. If you trust anyone in the world on these topics, these are the people you trust.
journalofhospitalinfection.com/article/S0195-…
2/ Dispelled myths:

Myth 1: #Aerosols are droplets with a diameter < 5 μm
Myth 2: All particles > 5 μm fall within 1-2 m of the source
Myth 3: If it's short range, then it can't be airborne
Myth 4: If R0 isn't as large as for #measles, then it can't be airborne
3/ Dispelled myths:

Myth 5a: If it's #airborne then surgical #masks (or cloth face coverings) won't work
Myth 5b: The virus is only 100 nm (0.1 μm) in size so filters and masks won't work
Myth 6: Unless it grows in tissue culture, it's not infectious

#COVIDisAirborne
Read 5 tweets
17 Dec 20
1/ During July 2020 many worked quickly to scramble #COVID19 prep before the Fall classes. I helped model estimated COVID #aerosol risk as @UofDenver made plans. Not allowed then, but shared now in case it can prompt discussion for Winter prep.

Doc + 🧵:
bit.ly/3gVfMcu
2/ A key concern at the time (& still) was #music ensemble classroom activities, b/c it was obvious early on that #COVIDisAirborne and that #choir & wind instruments were likely to present high COVID #aerosol risk.

nfhs.org/articles/unpre…
3/ Using my version of an aerosol #boxmodel, I calculated probability that #SARSCoV2 could infect after breathed out by someone in specific classrooms. With this I could easily investigate best prevention bang for buck. I.e. Rehearsal duration? Wait time b/n classes? Etc.
Read 20 tweets

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