Discover and read the best of Twitter Threads about #aerosol

Most recents (24)

I'm excited to share with you our recent @biorxivpreprint where we demonstrate that @vaxart mucosal Ad5 #SARSCoV2 vaccines not only protected against disease but also reduced transmission after post-#vaccination #SARSCoV2 infection in a hamster model.… A🧵/
If you follow me, you are well aware of my obsession w/ #mucosalimmunity.😂Protection generated at mucosal surfaces is at the crux of one of the biggest questions we need to answer during this unique phase of the #pandemic - How do we decrease #SARSCoV2 #transmission to others.
Considering most of the world is unimmunized (including most kids <12), the possibility that a vaccinated individual with a post-vaccination infection (aka #breakthrough) can spread #SARSCoV2 is a public health risk. We need #transmissionblocking strategies.
Read 19 tweets
@prof_nch (1/?) Profs thinking it’s ok to exercise privilege & unmask to teach in indoor classroom of students who must attend or possibly fail class—either have COMPLETELY NO understanding that 1)#aerosol is main transmission route for #COVID19; 2) how aerosol transmission actually works;
@prof_nch (2/?) 3) #Delta is hypertransmissible with rate of 1 infecting on avg 5-7 more vs earlier strains 2-3 more; 4) most infected don’t know they’re infected when they are at their most infectious because symptoms only show after peak infectiousness—if ppl not asymptomatic; …
@prof_nch (3/?) most have no real functional understanding of indoor air quality in own classrooms & rely solely on air system filtration—don’t monitor it with CO2 meters, keep windows/doors open; 4) don’t think about minimal acceptable air quality vs ‘good/excellent’ by #ASHRAE standard;
Read 12 tweets
wow, auf @ORFImZentrum ein Schüler, der Klartext spricht (ans Bildungsministerium): "Sie können sich loben, so viel Sie wollen, aber die Massnahmen kommen bei uns nicht an. Die Verantwortung an uns ab schieben, weil wir die Infektionen von aussen in die Schulen tragen, ist
einem Bildungsministerium nach 1.5 Jahren Pandemie nicht würdig." Grosses Kino - mehr solcher Schüler auch in @srfnews
Nicht nur #ElternGeschichtenCH, sondern auch #GeschichtenAusDerSchuleCH (aka #SchülerInnenGeschichten)
Auch @rendiwagner :"Schülerinnen und Schüler, Lehrerinnen und Lehrer, Eltern - fühlen sich im Stich gelassen." In A 🇦🇹 haben 7500 Eltern haben ihre Kinder abgemeldet. Nur zu einem Schluss kommen: "Das ist Management by Chaos."
Read 37 tweets
[Thread] Workplaces & #Covid19

😷 Many people WFH are concerned about risks in offices, schools, colleges & other buildings

🏢Workplace safety is regulated in EU (& other places). Virus is a biological agent & that requires precautions @EU_OSHA 1/…
‘identification & assessment of risks is starting point for managing occupational safety & health.. Employers are obliged to revise risk assessment when there is change, to consider all risks, including affecting mental health..& to make an action plan’ 2/…
In Ireland, workplace safety is the responsibility of the Health & Safety Authority @TheHSA

#Covid19 resources here:… 3/
Read 17 tweets
Live: International dream team of air quality experts talking about how we're not doing enough to prevent #delta transmission in schools
Worst-case scenario: Children's hospitals overloaded with 1/3th the beds needed, and 1/5th the PICU beds needed
Delta primarily spreads through #aerosol inhalation. The 6-ft rule is insufficient. The 15-min rule is insufficient. If someone must eat indoors, they should not talk. The infectious person does not have to be in the room at the same time as you
Read 24 tweets
This interview with @mtosterholm is 🔥. One of the clearest & most succinctly accurate 6-min summaries of where we are with Delta/COVID mitigation, masks, & vax (best part starts at 1:30).

#VaxUp #BetterMasks #N95 #MasksInSchools
A few quotes below. h/t @PPEtoheros, @citlanx
"This virus is an #aerosol. It’s transmitted in the air, just like we see with cigarette smoke. If you’re in a room and you have a covering on your face and you can smell* the smoke, then you know you’re also getting virus in there if in fact you had an infected person in there."
* (Editorial comment on the smoke smell comment. Aerosols in smoke come out as a concentrated plume, waft through the air, & build-up indoors. But the smell is from the gases & can go through masks, whereas aerosols are blocked. Good visual analogy, but it breaks down at smell).
Read 7 tweets
1/ Our paper is now published in final peer-reviewed form in CID! In this study, we recruited 22 #COVID19 patients at NCID and collected breath samples using a G-II machine while they were talking, breathing, and singing.
@IDSAInfo @drkristenkc @Don_Milton…
2/ 13 (59%) of patients had detectable #SARSCoV2 RNA by PCR in exhaled breath samples, with 85% comprising fine aerosols <5um. There was significant variation between patients, with 2 patients accounting for 52% of the total viral load - may explain so-called "super-emitters".
3/ Detectable RNA in aerosol was associated with earlier day of illness: median 3d (IQR 2-5) for those with detectable RNA vs 5d (4-7) for those without. It is clear that patients are most infectious at illness onset, emphasising need for early case detection and isolation.
Read 7 tweets
Why it is important to equip day-care centres and #schools with mobile #air #filters: #Aerosol researchers launch position paper!

The scandal about the still insufficient equipment of day-care centres and #schools with #mobile #air #filters suggests that…
decision-makers in the ministries and administrations have still not understood how infections with the #coronavirus occur. The Deutsche Forschungsgemeinschaft (#DFG, German Research Foundation) is now countering this
with an information paper that explains the correlations in simple terms.
It clearly states that it is ⚠️#negligent to rely solely on window ventilation in educational institutions.⚠️
Read 31 tweets
Logik: Die indische Mutante #Delta (#B16172) breitet sich massiv in #England aus und da sollte man erwarten, dass das #RKI sofort die unzureichende #Einreisequarantäne verbessert - aber nein - das RKI stuft die #COVID-Gefahrenlage für Deutschland herunter
Hallo Dr. #KaiSchulze, ist für das @rki_de der Ausbruch der indischen Mutante #B16172 in #England isoliert? Kann #Delta nicht durch die löchrige #Einreisequarantäne nach DE eingeschleppt werden? Wie kann man jetzt die COVID-#Risikobewertung herabstufen?
Strategie #Herdenimmunität
Todesfälle wurden offenbar einkalkuliert. #Brasilien sollte durch natürliche Infektionen zur Herdenimmunität geführt werde. Das bedeutet mit 1% IFR, 70% Herdenschwelle >1,4 Millionen einkalkulierte Todesfälle #Bolsonaro #COVIDZID…
Read 31 tweets
#BC ought to be grateful for work of @PennyDaflos asking hard questions & keeping officials accountable to truth & science during #COVID19 👉👉…
#DrBHenry gaslit #BC that she would ‘follow the science’: “Responses from British Columbia officials are part of a damning analysis on the reluctance by public health to acknowledge the airborne transmission of #COVID19 despite scientific consensus on the matter.”
#DrBHenry @adriandix & #BC #PHO ongoing refusal to recognize the primary transmission route of #COVID19 by #aerosol mechanism surely hobbled #BC response—to what extent & cost —ultimately in lives lost, #longCOVID, trauma, suicides, etc. have yet to be determined
Read 5 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)
(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+…
(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. 🙏…
Read 3 tweets
Dovremmo pensare ai sistemi di #trasporti. Sono gli assembramenti che diffondono il #SARSCoV2 e anche gli asintomatici con un'alta carica virale trasmettono via #aerosol in condizione di super diffusione.

N.B. Al 1° picco venivano testati solo sintomatici
Read 4 tweets
Partial good news out of @CDCgov today.…
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.
(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:…
(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
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 47 tweets
Das Robert Koch-Institut (#RKI) und die
"wissenschaftliche #Evidenz" in der Corona-#Pandemie
Ein Jahrhundert vor der Corona-#Pandemie leistete Dr. #Wu Lien-teh Pionierarbeit: Er erkannte, dass sich die #Lungenpest über die #Luft ausbreiten konnte, und mahnte, Menschen sollten zum Schutz #Masken tragen… Image
#Mesny, ein bekannter französischer Arzt, verunglimpfte Wu und weigerte sich, eine #Maske zu tragen. Er starb an den Folgen der #Lungenpest. 60.000 Wu-#Masken halfen die #Epidemie unter Kontrolle zu bekommen. Die heutige #N95-Maske ist ein Nachkomme der Wu-Maske
Read 34 tweets
Infektionsgefahr in #Schulen über belastete #Aerosole
Professor #Kähler schließt sich der #AITAsk Bewertung an:
"#Lüften alleine reicht nicht. Die Schulen wurden ja lange zugemacht, weil es eben nicht reicht". #twlz #kmk #rki…
Schulen sind mittlerweile wieder geöffnet, weitere Jahrgänge sollen folgen, dabei steigen bundesweit die Infektionszahlen. Gleichzeitig breitet sich die Mutante #B117 weiter aus. #Schulen sollen "eher" keine Pandemie-Treiber und dank #AHA+L sicher sein, sagt das #RKI. Stimmt das?
Eine erste Warnung, was ein #Superspreader im #Klassenzimmer bewirken kann und warum #Schulen sehr schnell zu einem Pandemie-Treiber werden können, zeigte das Ergebnis der #AITask-#Modellierung bereits im August 2020: Superspreader Klassenzimmer #twlz #kmk
Read 135 tweets
Logik zum #Öffnungsplan der #Bundesregierung
Wo, wie und wie schnell infiziert man sich mit dem #Coronavirus? Solange die Regierung Entscheidungen - magels Datenlage - ohne Evidenz trifft, solange ist es Willkür, wann welche Bereiche geöffnet und andere geschlossen bleiben #Spahn
Die Mutante #B117 erreicht in diesen Tagen -in den ersten Bundesländern- ihre #Dominanz. #R steigt zeitgleich und die #Regierung erhöht per #Öffnungsplan die #Mobilität: B117, Öffnungsplan u. gesteigerte Mobilität sind drei Faktoren die logisch #R exponentiell beeinflussen können
Zeitgleich werden #Kitas u. #Schulen geöffnet, also die Versammlungsorte, vor deren Öffnung uns Experten und Ärzte aus #Israel u. Kanada warnen. Begründet wird die #Öffnung mit "Meinungen" von Wissenschaftlern, deren #Studien -manipulierte Daten- aus #Schweden zitieren #twlz #KMK
Read 243 tweets
Schwere Anschuldigung
Whistleblower veröffentlicht Emails, die beinhalten, dass ein Experte um #Tegnell absichtlich Daten zu COVID-Fällen in #Schulen u. Todesfälle von Kindern manipuliert haben soll, die Veröffentlichungen werden geprüft, hier Auszüge…
Offiziell soll die COVID-Pandemie in #Schweden nicht zu einem Anstieg der Todesfälle bei #Kindern geführt haben:
Die von #Malmberg erhaltenen E-Mails zeigen jedoch, dass #Ludvigsson im Juli 2020 an #Tegnell schrieb:
„Leider sehen wir einen klaren Hinweis auf eine übermäßige #Sterblichkeit bei #Kindern im Alter von 7 bis 16 Jahren, dem Alter, in dem Kinder zur #Schule gingen.“
Read 45 tweets
Reducing #COVID19 #Airborne #Transmission Risks on #PublicTransportation Buses
Wearing of #facemasks reduced the overall particle count released into the bus by an average of 50%, the dispersion distance by several feet and #aerosol particles by 84.36%. Image
🔝#SARSCoV2 Infects Human Engineered Heart Tissues and Models COVID-19 Myocarditis
#COVID19 can kill heart muscle cells, interfere with contraction. Details of how #coronavirus infects #heart: models of tissue damage may help develop potential therapies. Image
High-content screening of coronavirus genes for innate immune suppression reveals enhanced potency of SARS-CoV-2 proteins
196 protein products of seven coronaviruses: the genes encoded by #SARSCoV2 are generally more potent immune suppressors than others Image
Read 236 tweets
Was machen bei steigenden Zahlen und bei wachsendem Anteil von VoC (Variants of Concern - besorgniserregende Varianten) wie #B117?
#ECDC gibt dazu klare Empfehlungen. Ob Hannovers OB @BelitOnay das gelesen hat vor Öffnungs-Forderungs-Paper Unterschrift?
H: Inz 115 & #B117 40-50%
Hier nochmal zum im Thread bleiben die "Options for Response" der @ECDC_EU .
3/ Die Öffnungsforderung von 17 Oberbürgermeistern, darunter #Onay will das Gegenteil.➡️… via @HAZ
Read 58 tweets
Whichever way you spin it, a BIG BANG return to FULL opening of ALL English schools on a single day is INSANE!
Mixing 10M children w/ all the staff that it will entail, with current disease prevalence & more transmissible variants is a sure fire way to INCREASE TRANSMISSION!1/8
As cases rise, WHICH THEY WILL, it’ll be impossible to know which age ranges are responsible quickly & change course without causing absolute havoc to the education of the children & to the lives of their working & non-working parents. 2/
And of course, that’s not even considering the effect on the individuals who may needlessly become seriously ill w/ #COVID19, get #LongCovid or sadly die.
On so many levels, a phased return is needed...NO....
IS ESSENTIAL to allow careful monitoring & a chance to change tack. 3/
Read 8 tweets
⚠️#Ocular #MRI Findings in Patients with Severe #COVID19: A Retrospective Multicenter Observational Study
All patients had nodules in the macular region, 8/9 (89%) had bilateral nodules, 2/9 (22%) had nodules outside the macular region. Screening needed. Image
⚠️🔝New-Onset #IgG #Autoantibodies in Hospitalized Patients with #COVID19
An international team of researchers studying COVID-19 has made a startling and pivotal discovery: The virus appears to cause the body to make weapons to attack its own tissues. Image
⚠️🔝Patterns of myocardial injury in recovered troponin-positive COVID-19 patients assessed by cardiovascular magnetic resonance
Damage to the heart found in more than half of #COVID19 patients discharged from hospital who show raised levels of troponin. Image
Read 235 tweets
1/ Interesting paper showing high efficacy of portable HEPA #filtration to reduce aerosol concentration in a high school classroom during use.

By very experienced German aerosol group Curtius et al.; via @ASTJournal.

With short🧵on room air filtration.…
2/ "In times when classes were conducted with windows and door closed, the aerosol concentration was reduced by more than 90% within less than 30 min. when running the purifiers (air exchange rate 5.5 ACH). The reduction was homogeneous throughout the room ..."
[note log y-scale]
3/ Figure 3: Highly reproducible reduction in aerosol particle concentration [uCPC] in a closed classroom without air purifiers (blue line) and with 3 or 4 air purifiers operating at speed 3 or 4 (max).
Read 15 tweets

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