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.
"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."
"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
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."
"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
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.
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.
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).
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).
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/
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."