Discover and read the best of Twitter Threads about #Ventilation

Most recents (24)

1/ Public Health @cityofhamilton, to stamp this out fast, you should issue an order requiring off-site air-gapped isolation/quarantine accommodation for those with an active infection. cbc.ca/news/canada/ha…
2/ Off-site air-gapped isolation can take the form of individual trailers, or a newer hotel that has been tested for dwelling unit compartmentalization.
3/ We know from decades of building science that there is significant unintentional air transfer between suites, especially in older buildings.
Read 7 tweets
❗️@WHO updates on main mode of SARS-CoV-2 🦠 transmission❗️

2021.04.30 Q&A ⤵️ ‘How does #COVID19 spread between people?’

I cannot overstate how seismic this paradigm shift is, and should be, in guiding a revised Risk Assessment & Controls framework.

who.int/news-room/q-a-… Image
The virus 🦠 SARS-CoV-2 can spread from an infected person’s mouth or nose in small liquid particles when they cough, sneeze, speak 🗣, sing 🎤, or breathe🧘🏻‍♀️.

[why mask needs to cover👃& 👄]

These particles range from larger respiratory droplets 💧 to smaller #aerosols 💦. Image
The SARS-CoV-2 virus 🦠 spreads *mainly* between people in close (short-range) contact, typically within 1 meter (3 feet) of each other.

How?
When #aerosols or droplets containing the virus 🦠 are INHALED or come into DIRECT CONTACT with the [mucous membranes of] 👀,👃, or 👄. Image
Read 6 tweets
U of T is making all classrooms achieve 6 ACH with #ventilation and #filtration, the same as for health care patient exam rooms. They measured air flow.
THIS should be the target for all Ontario daycare, elementary, and secondary schools too.
utoronto.ca/news/u-t-asses…
Children will be the last to be vaccinated. Schools & daycares will benefit immensely from reduced cold, flu, seasonal allergies by upgrading to 6 ACH. The time to start was a year ago. The next best time is tomorrow.
Big shout out to @ShellyMBoulder and the UC Boulder team that led the way on this last summer.
Read 4 tweets
ICYMI: Resource page on COVID transmission & prevention (focus on airborne aerosol spread) is up to:
☑️580+ media articles
☑️285+ science articles
☑️tons of videos; infographics; webinars; tweet threads; reports & tools
☑️scientists to follow
☑️more (1/x)
bit.ly/3fzmB16
(2/) If you are looking to learn about #COVID transmission & prevention, this curated page is a long & growing set of educ. resources, w/ focus on inhalable #aerosol, #airborne spread.

Lots on aerosol basics, new science, #masks, #ventilation, #COVIDCO2+
docs.google.com/spreadsheets/d…
(3/) The COVID page is not meant to be 100% comprehensive (one-person effort; be gracious), but a broad & freely available source for practical & important info.

As always - feel free to send any important articles I've omitted or other suggestions. 🙏
docs.google.com/spreadsheets/d…
Read 3 tweets
Naaah, the massive gym outbreak couldn't possibly be lack of #ventilation. That rooftop unit is in excellent condition. 😬😬😬
I don't even know what I'm seeing. Is that charred polyisocyanurate spray insulation?
To be fair it's only one of six units, the others appear to be better.
Read 5 tweets
So today I was lucky enough to get a vaccine.

Now I am eagerly waiting for day 4 to pass uneventfully.

Also wore my lucky shirt for the win.

#COVIDisAirborne
#COVIDVaccination
#AirbornePPE
#Ventilation
Before going for my AZ vac I wondered about consent when the choice is either (a) consent to the AZ vac or (b) do not consent to the AZ vac. I thought about VIPIT and my discussion with a med friend about how many people that might be.
Him: if we vax say 10m with AZ and expected rate of VIPIT is 1:500000 (Buttery) then expect 20 cases and 6 deaths (assuming mortality of 30%).

I reflected that it was a risk number I was being asked to consent to, a risk of being one of the 6 in 10m c/f no severe covid/death
Read 13 tweets
1/ Helpful clarification by #CDC w/ important practical implications to avoid wasting energy & money on excessive surface cleaning:
"each contact with a contaminated surface has less than a 1 in 10,000 chance of causing an infection"

HT @JudahWorldChamp
cdc.gov/coronavirus/20…
2/ Important to note that COVID can potentially spread in individual cases via direct/surface contact, via cannonball-like droplets, or inhalation of aerosols.

The brief clarifies that surfaces are statistically very unlikely to cause many infections; so focus most on the air.
3/ From CDC brief today:
"However, based on available epidemiological data and studies of environmental transmission factors, surface transmission is not the main route by which SARS-CoV-2 spreads, and the risk is considered to be low."
Read 5 tweets
Partial good news out of @CDCgov today. cdc.gov/coronavirus/20…
Recognition that fomites are a minor route, and stop the #hygienetheatre . Also good, and pathbreaking that they cite #QMRA studies in support. 1/N
Interesting that they use a 1/10,000 from a surface contact as being indicative of low risk from fomites (many of us have seen that number before). But, still some problems in this updated science brief. 2/N
Opening sentence: "The principal mode by which people are infected with SARS-CoV-2 (the virus that causes COVID-19) is through exposure to respiratory droplets carrying infectious virus." While they don't use the word #aerosol in the body 3/N
Read 5 tweets
(1/8) Time for engineering solutions.
Can we reopen #hotels #restaurants #bars on 1 May 2021 (or even before)? Taking into account measures below, answer is YES. Based on peer-reviewed published research & solid arguments. Scientific evidence & arguments below.
#COVIDー19 #COVID
(2/8) We did STRESS-TEST: worst-case scenario in #aerosol production: full #gym with all persons exercising vigorously. We tested combination #ventilation & #aircleaning: cost- & energy-efficient solution to reduce aerosol particle concentrations. See: sciencedirect.com/science/articl…
(3/8) Movie of this experiment: 35 test persons exercising; different settings #ventilation & #aircleaning:
Work by @TUeindhoven @plasmamade supported by @Sportinnovator & @gem_Eindhoven Ongoing #CFD simulations supported by @Microsoft @ANSYS
#COVIDー19
Read 8 tweets
What do we mean by #UseAirbornePrecautions? There are clear guidelines in health care settings, but what do we mean by it for the public? A 🧵 of 🧵(met-thread) on this. Strap in, this will be long 1/
2) First, this is not the first #airborne problem we have faced, and it won't be the last. And not all of them are exotic pathogens. Some could be as mundane as dust, smoke, pollens, volatile/semi-volatile organic compounds. They are all around our living space
3) Not all #airborne troubles are created equal. For example, I am a lot more allergic to cigarette smoke than incense. This varies from person to person and trouble to trouble. Some do not have any smell and can still be a "headache".
Read 41 tweets
1) Morning @GavinWilliamson, just reading the update from @PHE_uk @GOVUK below ⬇️.
gov.uk/government/pub…
2) Wondering how this particular bit of advice ⬇️ will play out in schools & early years settings after #Easter?

Crowded poorly ventilated classrooms w/ up to 30 kids from different households are the very essence of HIGH RISK spaces. Dining rooms/PE halls could even be worse!
3) If I’ve understood it correctly anywhere in the RED AREAS needs extra attention?

INDOORS ✅
HIGH OCCUPANCY ✅
SILENT, SPEAKING, SHOUTING, SINGING, PHYSICAL EXERTION ✅
POORLY VENTILATED ✅
& NO FACE COVERINGS ⬆️ THE RISK
Read 13 tweets
New pre-print: “Respiratory aerosols and droplets in the transmission of infectious diseases”

Happy to contribute to this deeply detailed review paper by Mira Pöhlker et al. & colleagues at the Max Planck Institute for Chemistry.

Link: arxiv.org/abs/2103.01188…

A 🧵summary (1/x)
2/ Preprint review is very detailed: 50 pgs, 20 figures, 7 tables, >360 references.

☑️Reviews literature:
- Respiratory particle size distributions (rPSDs)
- Physical properties
- Emission & shrinkage mechanisms
☑️New multimodal parameterization of rPSDs
☑️Practical perspective
3/ The review ends by showing a parameterized size distribution of respiratory particles & the risks in different parts of a room using #masks, #ventilation, and #filtration. Broad application to SARS-CoV-2 other respiratory viruses.

Link: arxiv.org/abs/2103.01188…
Read 16 tweets
Daily Bookmarks to GAVNet 03/30/2021 greeneracresvaluenetwork.wordpress.com/2021/03/30/dai…
Complex Systems: Volume 30, Number 1 (2021)

complex-systems.com/current/

#complexity #journal #CurrentIssue
The Law of Regression to the Tail: How to Survive COVID-19, the Climate Crisis, and Other Disasters

papers.ssrn.com/sol3/papers.cf…

#RegressionToTheTail #risk #FatTailedRisk #COVID19 #pandemics #ClimateCrisis #RiskMitigation
Read 8 tweets
1/ Airborne transmission, and the 3 feet vs. 6 feet question: A 🧵 with links for policy advocates trying to sort through the science...

WARNING: Nuance Ahead
2/ COVID-19 is mainly spread by inhaling small particles.

Timeline with illustrations, articles, studies:
#COVIDisAirborne #masks4All #bewareOfSharedAir #ventilation. See: its-airborne.org/covid19-timeli… via @AerosolizedC19

Airborne Transmission FAQ by experts: tinyurl.com/FAQ-aerosols
3/ In addition, here's Dr. @linseymarr and Dr. @jljcolorado's bibliography regarding "Transmission of COVID-19." They're top experts.
tinyurl.com/p4h9mbzz

"What We Know" 2021 summary: Respiratory plumes/short-range "close" exposure are <1.5 m (4.92 ft)
tinyurl.com/3sbktpzz
Read 27 tweets
[Thread] Chicago didn’t have a second wave of Spanish Flu.. so what did they do, & how did the city re-open when there was no vaccine? #Ventilation #COVID19 1/
..here are the public health measures that Chicago took on the autumn of 2018
‘open window ventilation in all school rooms.. pupils warmly dressed.. daily check on pupils & absentees in schools.. use of masks.. landlords required to heat homes.. ’ 2/ documentcloud.adobe.com/link/track?uri
..’isolation & quarantine.. home nursing provided (see my thread on home nursing).. churches required to improve ventilation.. 150 city health officers on full time service’ 3/
Read 17 tweets
💈One Year On. Our scrapbook.

Kids do get #COVID19
Kids can be #Asymptomatic or #Atypical.
Kids can have a mild infection, or get #PIMS
Kids can get #LongCovid

2000 kids NOT yet better.
Families disbelieved.

⚠️Contains graphic images.

longcovidkids.org #MothersDay
The numbers of children with #LongCovid are rising with every #COVID19 infection.

⚠️1 in 8 primary age children will get Long Covid
⚠️1 in 7 secondary age children will get Long Covid.

It appears to makes no difference if a child has a pre-existing condition or not.
Tragically children can die.

Thankfully the numbers are low compared with adults.

Every family that has lost a child will be devastated, the fact the numbers are low will have no bearing on their grief.

longcovidkids.org

#LongCovidKids #MakeSchoolsSafe
Read 6 tweets
🧵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
[#Thread]
#SARSCOV2 & #VariantsOfConcern
#B117 #B1351 #P1
SARS-CoV-2▪︎Genetically related to 2003 SARS virus▪︎Named Feb 11 2020 #COVID19▪︎Feb 24 2021 Global Cases 112,409,584, Deaths 2,492,420▪︎Feb 24 2021 US Cases 28,313,003, Deaths 504,295

/1
#UKvariant #B117▪︎Discovered Sept 2020▪︎80+Countries▪︎1st US Dec 2020▪︎Feb 24 2021 US Cases 1,881 across 45 States▪︎Estimated 30-50% more transmissible (spreads easier&faster)▪︎UK suggests the strain may cause more severe cases & 30% increased risk of death. /2
#SouthAfricanVariant #B1351▪︎Appx same time as #B117▪︎Feb 24 2021 US Cases 46 across 14 States▪︎Dominant strain in Zambia Dec2020▪︎Estimated 50% more transmissible▪︎No evidence yet of increased severity▪︎Mutated Spike Protein allowing latch to human cells easier/3
Read 9 tweets
Hey Tucker Carlson: #BillGates called, he has #proof for your #crossfit gym owner.
HINT: #ItsScience
@CDCMMWR #COVID19 cases among attendees of indoor high-intensity classes at a gym where many attendees did not wear masks consistently during exercise bit.ly/MMWR22421b /1
Increased respiratory exertion facilitates #SARSCoV2 transmission; outbreaks linked to indoor activities have been reported. /2
Aug 2020, 55 #COVID19 cases were identified among 81 attendees of indoor high-intensity classes at exercise facility. 22 (40%) persons w/COVID-19 attended on or/after the day symptoms began. Most (76%) wore masks infrequently, including persons w/(84%) & w/o COVID-19 (60%). /3
Read 5 tweets
One of the most bizarre & troubling bits of the #ReopeningSchools saga is that @educationgovuk & @BorisJohnson have ignored every single plea from teachers, early years staff, pupils & their families to #MakeSchoolsSafe & wasted all the months they have had to do so. 1/14 🧵
2)They’ve turned their backs on plentiful advice from #SAGE, @IndependentSage & @NEU.
Even @CMO_England has made his reservations as clear as he can from a rather difficult position.
But they’ve put their collective fingers in their ears & metaphorically said “La La La La”!
3) @GavinWilliamson & @halfon4harlowMP CLAIM the motivation for a speedy full opening of all school & early years facilities is the WELFARE OF CHILDREN!
They repeatedly cite educational, emotional, social & psychological needs.
Read 14 tweets
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
1/14 Morning @SophyRidgeSky, just watched the interviews w/ @DominicRaab @annelongfield @timspector & @bphillipsonMP re #schoolsreopening fully on 8th Mar.

Discussions focused on dates, primary vs secondary, catch up plans, mental health concerns, vulnerable children....
2/But NOT A SINGLE MENTION OF #coronavirus MITIGATION INSIDE SCHOOLS!

Has the MSM been banned from mentioning mitigation measures?
Are British children/teaching staff different to those across the world?
Do they have SPECIAL IMMUNE SYSTEMS?
3/NO FIGURES on how many children get #COVID19?
NO MENTION of how many become seriously ill, are hospitalised or die?
Absolutely NO WORD about the 1 in 7 or 8 children who get #LongCovid!
NO ADVICE for parents of children w/ diseases like Diabetes, severe Asthma etc.
Read 14 tweets
@dgurdasani1, you are a legend 👏!

PLEASE please listen to this from 07.20-40.30.
You will not regret it.

It clearly demonstrates the dangers of those without any CLINICAL knowledge & expertise being able to make crucial decisions that effect so many lives.
1/15 a thread.
Questions for the MODELLERS & MPs...

Have you actually seen a child poorly w/ #COVID19? It can be extremely frightening for both child & parents.

Have you seen/spoken to the parents of any children suffering w/ #LongCovid?
Why not listen to what parents & Drs are saying? 2/
#COVID19 is a multi-system disease with w/ many negative outcomes other than hospitalisation or death.

IT IS NOT FLU!

#COVID19 IS NOT FLU!

#LongCovid in both adults & children can be v debilitating & there’s currently v little knowledge about the long term prognosis. 3/.
Read 15 tweets
1. @JoeNBC @morningmika @Morning_Joe Former teacher here: Once again everyone wants to put in their 2 cents w/o input from those who have to deal w/implementing the policies. You, the politicians, the parents, the scientists, the doctors et al want #AmericanSchools to #Reopen!
2. You need to consider that most school bldgs are more than 50 yrs old. A local HS built circa 1970 has narrow slit like windows that don't open. So much for #Ventilation! #Classrooms are small & don't allow for social distancing. This is further complicated by having....
3. 20-25 #Students per class. Several yrs ago a friend had 32 students in her K-class due to budget cuts! I don't know the number in her class now but I doubt there's been a great change in the number. The kids who take buses to school are on top of each other all the time.
Read 7 tweets

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