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
And yes, mask rules are helpful when/where hospitals are overwhelmed, community transmission is high, if new surprise comes along, like Delta. Not sure about tying it to vax rate because of correlation between anti-vax and anti-mask. /4
I knew I would take some heat about this, but we need to start having this conversation because we're not going to mask forever and we're not going to get to zero risk. /5

• • •

Missing some Tweet in this thread? You can try to force a refresh
 

Keep Current with Linsey Marr

Linsey Marr Profile picture

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @linseymarr

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"Current infection-control guidelines subscribe to a contact/droplet/airborne paradigm that is based on outdated understanding.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
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
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
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
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
11 Aug
Our new preprint led by Hawks and Duggal shows infectious virus emitted in air from hamsters (upper right) on days 1-2 but not later, even though RNA still there (lower right).
biorxiv.org/content/10.110… /1
We used a condensation particle sampler with & without cyclone. Saw similar amounts of infectious virus, so it's mostly <8 μm.

8-μm particles can float around for at least 13 minutes, and the smaller ones stay in the air for hours. /2
Sampling method does not exclude potential for resuspension from fur and ground, but there was more virus in oral swab & nasal wash than on fur. Either way, though, there's infectious virus in the air. /3
Read 4 tweets

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!

Follow Us on Twitter!

:(