The more I read this story of #superspreading in a Chicago gym, the more outrageous it is, especially this late in the game. A few amazing quotes below.

So preventable: distance, wear good masks, improve ventilation & filtration.

HT @linseymarr (1/x)
cdc.gov/mmwr/volumes/7…
2/ Just amazing this can be true ...

"Overall, 43 (78%) attendees with COVID-19 participated in multiple classes while potentially infectious.* Twenty-two (40%) attendees with COVID-19 attended on or after the day of symptom onset."
3/ This is why #COVIDisAirborne education is critical:

"Patrons brought their own mats and weights and were stationed ≥6 ft apart."
"Mask use, temperature checks, and symptom screenings were required on entry"

"however, patrons were allowed to remove masks during exercise." 🤦‍♂️
4/ So many without masks!

"Among 58 exercise class attendees who provided information on in-class behaviors, 44 (76%) reported infrequent mask use, including 32 of 38 (84%) attendees with COVID-19 and 12 of 20 (60%) without COVID-19."
5/ " infrequent mask use during class was reported more commonly among attendees with COVID-19 (32; 84%) than among those who did not have COVID-19"
6/ What gets me is many were symptomatic & several KNEW they were sick!

"Twenty-two (40%) attendees w/ COVID-19 attended an exercise class on or after the date of symptom onset, including three (5%) who attended on the same day or after they received the positive test result."
7/ Just unbelievable:

"Two attendees with COVID-19 (attendees A and B) reported symptom onset during August 19–20; each attended five classes during August 24–September 1 WHILE symptomatic."

• • •

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

Keep Current with Dr. Alex Huffman

Dr. Alex Huffman 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 @HuffmanLabDU

27 Feb
🧵1/ The #CDC update today (2/26) on "Ventilation in Schools and Child Care Programs" looks like good progress.

Details on #ventilation, #filtration, #bettermasks, w/ helpful links. Seems they're listening to @kprather88 @j_g_allen @CorsIAQ and others?
cdc.gov/coronavirus/20…
2/ The relatively short #CDC page seems to have more succinct, yet clear #K12 guidance & connection to other pages of support.

Though I admit, I haven't digested yet fully. What are your takes? (also e.g. @jljcolorado @linseymarr @ProfCharlesHaas @Don_Milton @ShellyMBoulder)
3/ I was pleased to see early mention that "Wearing a well-fitting, multi-layer mask helps prevent virus particles from entering the air or being breathed in by the person wearing the mask."

(BTW, need for good fit implies aerosols)

Links (twice) here:
cdc.gov/coronavirus/20…
Read 17 tweets
27 Feb
Opening #K12 schools safely requires applying the right airborne prevention. This article interviews the right people; listen to them!

"The state of ventilation in schools in the United States right now is woefully inadequate": @CorsIAQ

HT @jljcolorado
cnn.com/2021/02/25/hea…
"Right now, schools are looking to CDC and they are not getting the answers to the kinds of things we are talking about." "All of them look to CDC." said @CorsIAQ
"If you look at all the high profile outbreaks -- same underlying factors -- no masks, low ventilation. It doesn't matter if it's spin class, ice hockey, camps, classrooms, choir practice or restaurants, (it's) the same underlying factors" said @j_g_allen
Read 4 tweets
19 Feb
1/ Here's a quick bite (< 2.5 minutes) of overview on infectious respiratory aerosol emissions, #ventilation, and using #CO2 monitors as a tool in the fight against COVID & for healthy indoor air.

Thx to @KateM_NYC @YahooNews for the interview. #COVIDCO2
news.yahoo.com/co-2-monitors-…
2/ I recently gathered several interesting stories from recent CO2 measurements as well as a simple example of how I had fun measuring the ventilation rate in my house.

Peruse #COVIDCO2 for many more examples.
3/ Measuring #CO2 to estimate ventilation rate is a quick way of approximating the amount of "rebreathed air" (the portion of air you breath that has already been in someone else's lungs).

See thread by @CorsIAQ for good details here.
Read 6 tweets
19 Feb
1/ Another good preprint on mask efficiency tests; from a @NIOSH group that knows aerosols.

Lindsley et al.: "A comparison of performance metrics for cloth face masks as source control devices for simulated cough and exhalation aerosols"

HT @linseymarr
medrxiv.org/content/10.110…
2/ They explored a variety of respirators and masks. As expected, the collection efficiency of the N95 & surgical masks did very well. Masks with filters next, lowest filtration quality when only single-ply material used.
3/ The "fit factor"/FF (higher = better) is also critical. Look at the difference between the N95 and surgical masks in terms of fit (left).

Also see how much fit factor increased when more tightly fitted (below on right w/ ear loop adjusters to make snug).
Read 6 tweets
19 Feb
1/ More great work by @smogdr & team to test the performance of various kinds of #masks.

The (re)introduce mask "protection factor" (PF) as a fraction of particle mass that makes it through & also evaluate breathability, effect of mask construction, etc.
pubs.acs.org/doi/10.1021/ac…
2/ This is the thread of main points that @SmogDr put together associated with the now-published & #OpenAccess paper.
3/ And if you haven't already played around with the mask-testing data, @SmogDr & team built this interactive site (months ago) to look in detail at results from various masks.
jv.colostate.edu/masktesting/
Read 4 tweets
18 Feb
1/ Article summarizing a letter recently sent to the White House, CDC, NIAID, by a group of trusted colleagues.

“It’s time to stop pussyfooting around the fact that the virus is transmitted mostly through the air” said @linseymarr

Letter & quotes below.
nytimes.com/2021/02/17/hea…
2/ Read the short, important letter yourself:

"Immediate Action is Needed to Address SARS-CoV-2 Inhalation Exposure"
…ha-assets.sfo2.digitaloceanspaces.com/AIHA/uploads/P…
3/ "There is a pressing and urgent need for action. COVID-19 infections and deaths recently reached record levels. The roll-out of vaccines that started out in December rocky and slow is now improving, but it will be months before most of the population is vaccinated."
Read 9 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!