Discover and read the best of Twitter Threads about #ventilation

Most recents (24)

1/4 - "La très forte transmissibilité des nouveaux variants, a conduit, malgré la baisse prononcée du taux de létalité grâce à la protection vaccinale, à des nombres absolus de décès #COVID19 restés voisins en rythme annuel en 2020, 21 et 1er semestre 22."…
2/4 - "Il est donc temps de réfléchir désormais à une troisième phase dans la réponse à cette pandémie qui viserait à continuer à vivre “comme avant” la pandémie, tout en limitant davantage les hospitalisations et la mortalité du #COVID19."
3/4 - "Pour cela, il conviendrait désormais de s’attaquer à la source même de la transmission du coronavirus, afin de réduire les contaminations et de ce fait réduire substantiellement la mortalité du #COVID19, quels que soient les variants et sous-variants circulants."
Read 9 tweets
Great to see “signage and ratings”, “awareness”, and “visible assurance” prominent in @RAEngNews @CIBSE recommendations to ensure that the public understands the importance of “good indoor air quality.”

Short 🧵 on exemplar #signage schemes and pilots.

1/8 Image highlighting recommen...
As @CathNoakes writes, 'Scores on the Doors' is an example of such a scheme. 2/8

Between Oct 21-March 22 @IndependentSage and colleagues worked on a project to design, pilot, and evaluate a scheme to convey, in a non-technical way, #ventilation information ('scores / signs on the doors') for rooms, buildings, and venues. 3/8

Read 9 tweets
1/ Ventilation levels around Colorado, USA.

I'll start reporting what I find in different places I happen to visit.

Here @shakeshack restaurant in Boulder, 950 ppm CO2, not good, esp. since lots of people and not one mask to be seen.

#CovidCO2 #ventilation Image
2/ At the hardware store @McGuckins

765 ppm, not bad. About 1/3 of people with masks. Image
3/ At the sports equipment store, @REI in Boulder.

1184 ppm. Too high. 1/4 of the customers and 1/2 of the employees with masks. Image
Read 12 tweets
🧵 If the use of airborne #PPE & improving air quality in healthcare settings are to be ‘optional’ & ‘a matter of personal choice’, then we should give strong consideration to applying the same rule to the following #MedTwitter #MedEd #TeamGP 1/n
1. Handwashing before, between & after patients (& audits of it)
2. Plastic gloves & aprons
3. ‘Bare below the elbows’
4. Jewellery
5. Hair above the collar
6. Mandatory training
If you are recoiling in horror because
1. ‘Airborne transmission of COVID is controversial’
2. ‘The above are established evidence-based practices’
3. ‘COVID is mild, we can’t avoid it, we have to learn to live with it, we’re all vaccinated now anyway’,
Read 7 tweets
A must read if you are using #CO2 as a proxy for #ventilation/#IAQ: The ASHRAE Position Document on Indoor Carbon Dioxide by the experts including Drs. Persily, Mandin, Kipen, Lau, Sekhar, Ms. Lan Chi Nguyen Weekes @WBahnfleth @WargockiPawel…
"This position document discusses the role of indoor #CO2 in the context of building ventilation and IAQ based on ASHRAE’s long involvement with those topics as well as the interests of its members and stakeholders."
"The positions stated within address the use of #CO2 as a metric of #IAQ and ventilation, the impacts of CO2 on building occupants, the measurement of CO2 concentrations, ..."
Read 4 tweets
It has been an honour to walk alongside my friend & colleague of 21 years @BinitaKane & her daughter Jasmin on their courageous & inspiring journey. #LongCovid in adults children is real & serious. There are treatments available- sadly only for a fortunate few #TeamClots 1/n
(Everything I say is with the express permission of @BinitaKane). Jasmin is not the only child with #LongCovid who has been shown to have microclots & hyperactivated platelets. They are a consistent finding in kids & adults who have travelled for treatment to Germany & SA 2/n
Globally 100m are affected by this vile illness. In the U.K. alone this figure is estimated to be 1.8m, with 2/3rds reporting an adverse impact on their daily activities. 1% of primary & 2.7% of secondary school children fulfilled the criteria for #LongCovidKids 3/n
Read 17 tweets
"No matter how outrageous a claim may initially seem, we all need to consider the possibility that it might actually be true – just consider how many things that you never thought would be possible are now reality." -- Rebecca Sherry Eshraghi…
Sustaining Antimicrobial Stewardship in a High–Antibiotic Resistance Setting | Clinical Decision Support…
#AntibioticResistance, #AntimicrobialStewardship, #ClinicalDecisionSupport, #CohortStudy
Read 13 tweets
⚠️BA2 DOMINANT—Welp—CDC reports the #BA2 subvariant is now 54.9% of all cases as of March 26th. ➡️This matches our forecast of March 26th BA2 dominance **right on the nose**—for equilibrium plateau point. Wastewater plateaued too. Surge coming in April.

Forecast HT to @JPWeiland ImageImage
2) Wastewater signals also show sewage #SARSCoV2 levels also has plateaued from its steep drop. The plateau coincides with the “criss crossing” of old BA1 drop and new #BA2 rise. Image
3) To be honest, it didn’t take being a rocket scientist or epidemiologist to figure out where #BA2 is taking us when you see this exponential graph on a log scale. BA2 was headed for dominance for weeks.

HT @DrWilliamKu Image
Read 16 tweets
I promised I would provide a way to calculate room air exchange, using a simple MERV-13 filter & a box fan. The sweet spot seems to be 6 exchanges per hour. This means all the air in the room is moved through the filter 6 times in 1 hour. 1/6 #ProtectHCWs #ProtectKids #Covid #BA2
First we need to get the volume of a room. It doesn’t need to be perfect! But note units are important. We are using feet/inches here. Use this calculator & input the measurements, A, B, & C as shown in the graphic below. Order is NOT important 2/6 #Filter…
I found a company that did calculations using a box fan on high speed & MERV-13 filters of different depths. The thicker the filter the BETTER the air flow! Strange but true. Note I added the Air Volume based on a 20” square box fan. 3/6 #N95 #BoxFanFilter…
Read 6 tweets
The @VSOrchestra Orpheum was built in 1927, shortly after the last worldwide pandemic ...."One of the most up-to-date ventilating systems on the continent was installed...Air was brought from the outside and blown through a series of water sprays or screens...1/2 #covid19bc
@VSOrchestra ..."heated to any desired degree, then forced through a system of ducts which distributed it to every part of the building hrough hundreds of small pipes which opened beneath the seats...2/n
@VSOrchestra ..."A complete change of air took place every three minutes, and with the aid of these huge air-washers, clean, dust-free air of even temperature was ensured at all times.” 3/n #orpheum #covid19bc
Read 8 tweets
🧵A thread - Same birthday gift three years in a row: a lesson in public health and politics
1/ It was the evening of Thursday, March 12, 2020. I was out shopping with my daughters. My youngest daughter had a gift certificate tucked in her purse. She was eager to find something to spend it on.
2/ Having turned nine years old, the day before, she was still bouncing with happy birthday joy.
Walking through the aisles of toys, I heard a notification on my phone. A text from a friend relayed the news that schools would remain closed after the upcoming March break.
Read 23 tweets
This week we will discuss #Ventilation during #Resuscitation. As a starter, we’d like to hear from you.

In your practice, which of the following ventilation parameters do you routinely measure during resuscitation?

@ERC_resus #ResusciTuesdays #ResusTwitter #CPR #ALS
Thanks a lot for all your answers.

Let’s reveal the right answer (and more) through this thread with this interesting information brought by @johannes_wittig
An incomplete story of excessive ventilation during #CPR
In 2004, Aufderheide et al. investigated the harmful dimensions of ventilation during CPR. #OHCA CPR attempts of 13 adults were observed; .. (1)..
Read 17 tweets
1/ So tired of smug garbage thought pieces in pubs like @TheAtlantic trivializing #COVID mass death & #HealthInequity

Thousands dying daily & cont'd health inequity means we haven't done what's needed to stop mitigations or "open" things that aren't even closed #UrgencyOfEquity
2/ Pieces like this endorse society brushing past those who remain at most risk from #COVID to move to a past inequitable "normal," while making a passing, half-hearted "that's tragic" comment about continued COVID health inequities & suffering.…
3/ Interesting that the author expressed concern that "Many white-collar workers still haven’t returned to the office" but failed to mention healthcare, retail, or factory workers. #UrgencyOfEquity #COVID
Read 22 tweets
Highly recommended! Detailed summary of the main engineering controls for airborne infection control to reduce transmission indoors:
#Ventilation #Filtration #UVGI
#DoAllTheThings! Implement multiple engineering controls to reduce airborne infection and improve indoor air quality
#UVGI Image
If you want a partial data dump of my brain, the Time Magazine article is a great summary.…
Read 4 tweets
I felt terribly sick on Saturday. Sore throat, flu symptoms, heavy head. My rapid test is negative. All my friends have #COVID19. Literally everyone. 349 cases in my kids school last week.Overcrowded and zero #ventilation. Sick teachers & sick kids. @ScholaEuropaea @JHahnEU
On Sunday the Far right of 🇪🇺 comes to Brussels to create appalling chaos. The unspeakable violence...the politicians scape goating others... It's a lawless crowd & they don't hear our prayers. 2/
Belgian 🇧🇪Twitter Pandemic experts fight over CST: vaccine obligations. Yeah, in this first world, this is the drama. My right to not wear a face covering or take a vaccine. Not about the health consequences of the children & vulnerable. 😥 3/
Read 21 tweets
I recognize a lot of names in the list of authors




They are wise, and know far more about #InfectiousDiseases and #epidemiology than I do

It is important to look at what this report does and does not say…

I don’t think there is anyone who would disagree with the message in these slides

Closing schools is a bad thing

Remote learning is disruptive and can lead to worse educational outcomes

As with everything in this #pandemic, poor and marginalized families far worst

In this slide the #ScienceTable argues that vaccination reduces the risks to children

Currently less than 50% of the 5-11 cohort is double vaccinated

Once again the risk is greatest for our #children with comorbidities or low socioeconomic status

They admit they don’t know…
Read 9 tweets
The air cleaner purchased by @nseducation for schools has a Clean Air Delivery Rate almost HALF of a common retail unit and may create secondary products by reacting with gas phase contaminants in a poorly ventilated room using photocatalytic oxidation #nspoli /1 Guardian Beyond Air F159E: ...
As seen in the photo, it's not running on its highest setting. For #ventilationequity in non-mechanically ventilated classrooms, should be a min 15 CFM per person, or 375 CADR for 25 people, AND at an acceptable noise level. How many per classroom? #DoTheMath! /2
Don't get me wrong, any filtration is better than nothing! But it's a mere band-aid over a gaping wound.
A DIY $120 #corsirosenthalbox will beat the air cleaners purchased by @nseducation AND can be used in STEM lessons! See /3 Screen capture of web site
Read 15 tweets
I’ve been seeing a push to get MCPS teachers KN95 masks.
Obviously, getting vaccinated is hugely important.
Ventilation in schools is important.
…and masks are certainly part of the mix keeping the air clear, because after all, #COVIDisairborne
As you are thinking about mitigating occupational hazards, you’ve got to think about the NIOSH hierarchy of controls. That upside-down pyramid is a good reminder to take care of the most important things first.…
That would be elimination – which we’d all prefer to see #Covid eliminated from @MCPS our schools…and preferably our lives!
Read 46 tweets
2/8 To assist with @GOVUK rollout of CO2 monitors to schools @CoSchoolsTools have created 4 videos, and other materials, that aim to explain how #CO2monitors can help #teachers manage their classroom #ventilation for comfortable healthier learning.
@MichaelRosenYes please could you help us get these videos to schools?

#CommunityAction #LongCovidKids #BackToSchool
#Education #MaskUp #Kids #SpotCovid

Read 8 tweets
Dear 🇧🇪,
Are we ready for the increased hospitalisations when schools start without mitigation? Have you seen the NHS difficulties that UK govt is ignoring? Is the GEMS committee looking at neighbouring UK and France?
@FranceDammel @JeroenSchoenm @jan_bertels @alexanderdecroo
I just saw this news. This is insane!!! 😱 No quarantine for vaccinated and no PCR test for those with high risk contact even if vaccinated have proven to be contagious? Is this the best 🇧🇪 can come up with? How will this affect schools? 1/3…
🌹So teacher's partner tests positive. Teacher doesn't have to test and continues teaching?
🌹Vaccinated student's family member tests positive and student doesn't need to test?
🌹How does 🇧🇪 plan to protect the children and their families?
Are you taking advice from Trump? 2/3 Image
Read 4 tweets
A 🧵 about my experience on aerosol research and airborne transmission of infectious diseases during my Ph.D. time, the academic struggles and challenges I faced pre-Covid and when it just emerged to proof that #COVIDisAirborne (1/13)
I started studying aerosols and infection control of aerosols at the Academic Center of Dentistry Amsterdam- ACTA (Dental Faculty of University of Amsterdam) in december 2015. Nobody back then cared about aerosols, but we did. (article in dutch)…
In March 2019 I worked with @WCMQatar - team of Prof. Abu-Raddad- where we used the Wells-Riley equation adjusted by Rudnick & Milton with the aim to estimate transmission risk and effect of measures that apply to dental professionals.…
Read 14 tweets
Annnnnnnnd… Cruise ship 🛳 COVID outbreak is back. New Orleans-disembarked ship has a probable #Omicron among them. Painful lessons from 2020 wants its damn money back. We just don’t learn in this pandemic do we? 😢 🧵

#COVID19 #MaskUp #ventilation #BoosterShots #cruiseship
2) Ten people aboard the Norwegian Breakaway, operated by Norwegian Cruise Line, tested positive on Saturday, before the ship docked, according to the Louisiana Department of Health, and by Sunday, that number had risen to 17, health officials said.…
3) That includes one “probable case” of the Omicron variant in a crew member, they said.
The Norwegian Breakaway, carrying over 3,200 people, departed from New Orleans on Nov. 28 and made stops in Belize, Honduras and Mexico before returning to Louisiana.…
Read 6 tweets
Oui je radote depuis des mois sur l’importance du #masque, de l’#aération et de la #ventilation pour lutter contre la #covid19. Alors voilà une petite contribution pour tenter de mieux comprendre ou même de convaincre ceux qui ont des doutes. #CestParti #thread👇👇👇1/12
Mais d’abord ce petit sondage. La #ventilation est cruciale dans tout lieu intérieur pour lutter (notamment) contre la #Covid19 : 2/12
La #Covid19 peut se transmettre par les mains (d’où l’importance de se les laver) et par les gouttelettes de salives (les jolis postillons☺️). Mais la contamination peut aussi se faire par #aérosols, et c’est le mode de transmission principal, surtout en milieu intérieur. 3/12
Read 12 tweets
🔴Transmissibility or Virulence : What should really worry us ?
Since these two have been widely discussed, given #omicron is around. A short explainer 👇.
3 plots below - from ~2x of Rt value and 1/2 of hospitalization rates (less virulent) to basal value (~ Delta wave)
Rt is the effective reproductive no.
One could clearly see why 2x Rt would create a sharper and ⏫rate of hospitalizations.
For a less virulent and highly transmissible variant, assuming 1/2x hospitalization rate, this would still create a significant wave of hospitalizations.
A much detailed mathematical basis to this was discussed in the past by @AdamJKucharski
Read 9 tweets

Related hashtags

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 ($3.00/month or $30.00/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!