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Linsey Marr Profile picture
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18 Nov, 4 tweets, 2 min read
@theNASEM webinar on Public Health Lessons for Non-Vaccine Influenza Interventions: Looking Past COVID-19 today at 1 pm nam.edu/event/advancin… Report released yesterday at bit.ly/3kHhZeW /1
The report recommends use of respirators, surgical/procedural masks, and multi-layer woven cloth face masks to reduce transmission of SARS-CoV-2, and states that face shields alone are not effective /2
It highlights the importance of physical distancing, ventilation, & air filtration to remove pathogens from the air, but recognizes that physical barriers are not effective & may actually be harmful /3
It validates non-RCT evidence. "science required for understanding of human respiratory emissions...has generated a body of robust evidence that is not well captured by EBM frameworks....rooted in basic physical principles, which are as predictable as the effect of gravity." /4

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More from @linseymarr

Linsey Marr Profile picture
22 Oct
Tang & I wrote about updating transmission routes to inhalation, spray, and touch, following up on suggestions by Yuguo Li and @Don_Milton. academic.oup.com/cid/advance-ar… /1
"Current infection-control guidelines subscribe to a contact/droplet/airborne paradigm that is based on outdated understanding. Here, we propose to modify and align existing guidelines with a more accurate description of the different transmission routes." /2
"This will improve the effectiveness of control measures as more transmissible variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) emerge." /3
Read 20 tweets
Linsey Marr Profile picture
21 Oct
Great editorial about "The COVID-19 crisis is almost certainly an indoor air crisis; it is very likely a ventilation crisis." (among other crises) onlinelibrary.wiley.com/doi/full/10.11… by Nazaroff @WBahnfleth @WargockiPawel Zhang /1
"The phenomenon of low risk outdoors and high risk indoors deserves some explanation. This is probably the most important observation in this pandemic. There is a simple explanation: dilution." /2
"For an ideal expired jet from a person breathing at rest, at a distance >1 m, there is >10-fold dilution from surrounding air because of...entrainment. If the surrounding air is totally free from infectious virus, as it is outdoors, the concentration beyond 1 m is very low." /3
Read 8 tweets
Linsey Marr Profile picture
21 Oct
Just as I advocated for mask use when needed, I'm going to join @j_g_allen in advocating for ending mask rules when no longer needed. In my mind, that's after kids 5-11 have a chance to get vaccinated. /1
My 10-yo will get vaccinated as soon as possible, not because I'm particularly worried about her getting Covid-19 but because I'm worried about her *spreading* it. /2
With the normalization of mask wearing in the US, I hope that people will feel comfortable wearing them or not wearing them as it makes sense (not for political reasons). /3
Read 5 tweets
Linsey Marr Profile picture
19 Oct
I wrote about applying what we've learned from Covid-19 to the flu. nytimes.com/2021/10/19/opi… Cleaner air (ventilation & filtration) is a "powerful tool for reducing the risk of Covid-19 transmission, & it should be embraced more thoroughly during this pandemic and to reduce flu"/1
We inadvertently squashed the flu last year, probably thanks to our interventions against Covid-19 combined with our pre-existing immunity to flu. @Lakdawala_Lab showed that this factor is a barrier to airborne transmission. journals.plos.org/plospathogens/… /2
@Lakdawala_Lab "I hope that Covid-19 has catalyzed a shift in thinking about the air we breathe. You wouldn’t drink a glass of water full of pathogens, chemicals and dirt. Why should we put up with breathing contaminated air?" /3
Read 7 tweets
Linsey Marr Profile picture
13 Oct
Our paper examining the origins of the erroneous 5 μm cutoff for aerosols v. droplets and the 6' rule is now published. One of my fave interdisciplinary collaborations yet, involving rhetoric, history, aerosol science, fluid dynamics. royalsocietypublishing.org/doi/10.1098/rs… /1
With @katierandall @EThomasEwing @jljcolorado Bourouiba. The 5-μm error came from conflation of how droplets/aerosols move through the air with where they deposit in the respiratory tract. The 6' rule came from misinterpretation of studies with bacteria settle plates. /2
These became entrenched through "citogenesis," which I would define as propagation of mis-cited work. /3 xkcd.com/978/
Read 4 tweets
Linsey Marr Profile picture
4 Oct
We did some more testing yesterday and updated tinyurl.com/VTkidsmasks with a column dedicated to efficiency as worn. Added results for KF94/KN95s received from @masknerd. Take homes: N95 clearly the best (small 3M Vflex 9105S), KF94/KN95s around 90%, most cloth masks ~60-80%. /1
@masknerd Cloth masks with filter are widely available. Most important is good fit and minimal leaks, which is easier to get with softer, more flexible fabrics, as we also found in @isjinpan's study on manikins. tandfonline.com/doi/abs/10.108…, free preprint at drive.google.com/file/d/1PoE0gk… /2
Based on our testing and some new studies, we moved all cloth masks to the BETTER category and moved surgical + brace or surgical + cloth double masking to the BEST category, which also has KN95/KF94 (small-sized N95s may work for big kids). /3
Read 4 tweets

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