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covid19 aerosol transmission 

"A room, a bar and a classroom: how the coronavirus is spread through the air.

Here is an overview of the likelihood of infection in three everyday scenarios, based on the safety measures used and the length of exposure":

english.elpais.com/society/202

covid19 aerosol transmission 

@fribbledom Interesting, that part about the classrooms never struck me. For most of my school life, classroom sessions were 45 minutes and then it was gtfo break time while the room was ventilated by opening pretty much every window possible. Especially during the winter.

covid19 aerosol transmission 

@espen

I guess that very much depends on the school system. In some countries teachers have their own room and students come to their room for each session.

In other countries the entire class stays in the same room all day long, and the teachers come and go after each session.

Where I grew up it was the latter , and there was roughly a one minute break between sessions.

covid19 aerosol transmission 

@espen

What we got was a 15 minute break in the middle of the day, which was also pretty much our only option to ventilate the rooms.

covid19 aerosol transmission 

@fribbledom Yeah, the latter for me as well, except for special activites of course. But breaks were 10 minutes which makes an untidy 55 minutes total. I think this is up to the school to determine though.

But with the arerosol spreading, would a 1 minute break be enough to make a difference? Did you leave the room during the break, or just wait for a new teacher?

covid19 aerosol transmission 

@espen

We left the room during the 15 minute break, but between sessions there technically aren't any breaks.

Teachers often need to move from one room to the another, that's the one minute break you get between the sessions.

Sometimes the next teacher was already waiting in front of the door, though. Then you're out of luck as a student.

I don't think one minute makes enough of a difference anyways.

covid19 aerosol transmission 

@fribbledom @espen
Query about people educated in the latter style: what did you do for classes that require specialised equipment, such as: chemistry, biology, physics, computer science, secretarial skills, metalwork, woodwork, crafting, ceramics, art, music, sport, dance?

covid19 aerosol transmission 

@floppyplopper
As mentioned, for me there were expections depending on the activity, so it was not a 100% one room only, but majority of classes were done there. Sometimes the teacher brought with them equipment to be used on trolleys, but larger items had their own specialised rooms.

And perhaps unfortunately since I suck at it, I cannot claim that dancing was one one of the classes taught. Nor am I sure what secretarial skills entail, although I suspect Im ignorant on the subject because all that comes to mind is someone going "he is ready to see you now" or on rare occation activities inappropriate for school. Oh well.

@fribbledom

covid19 aerosol transmission 

@espen @fribbledom
I'm old enough to have gone to school when they still had a room filled with mechanical typewriters. They already had computers though. A PC, a BBC Acorn, and a room filled with Commodore 64s. Later the art room got a BBC Archimedies and the Commodores were replaced with PCs running Windows.

We began to specialise at the 3rd year of that school (I was there for 7 years) and I went down the science route so I don't know what they did in terms of office worker/secretarial training. They had materials for trainng typing, even I had some training on letter writing, MS Word and Excel.

covid19 aerosol transmission 

@floppyplopper

There were special rooms for chemistry/physics, computer science, arts, and of course a gymnasium for sports.

@espen

covid19 aerosol transmission 

@espen
We had alternating 5 and 15 minute breaks, and of the next lesson was in the same room, we could (and mostly did) just stay there. In the later school years we often had two 45 minute lessons of the same topic, so even the teacher stayed in the room. In the 15 minute breaks, we _had_ to go outside. Ventilation according to teacher mood, weather and individual initiative :)
@fribbledom

covid19 aerosol transmission 

@fribbledom hey this is a really good study, thanks for sharing!

covid19 aerosol transmission 

@fribbledom
It's nice that they mention the simplifying assumptions and uncertainties of the model, but also what is certain, and why, with examples. Especially great in an article for laypeople.

This kind of stuff seems to slowly catch on, and it gives me hope. Pretending to know everything (or taking uncertain information as gospel) seems to me a huge source of misconceptions, wild accusations and conspiracy theory-level bullshit, as well es online flame wars.

covid19 aerosol transmission 

@fribbledom
...actually, taking (liberally-interpreted translation of) religious scripture as gospel is probably also a major source of not just online flame wars but actual IRL wars...

The concept of "makes sense, within some tolerance, and probably looks different from another angle" really seems to be hard to get into everyone's head, but it needs to become a thing if we all want to get along.

@fribbledom one of the best pieces I've seen for communicating the complicated probabilities of this virus

covid19 aerosol transmission 

@fribbledom I made a german version of the gif of the talking person.

covid19 aerosol transmission 

@fribbledom Good article. I’ve read a lot of articles on COVID19 transmission and many fall into the trap of scientifically detectable virus amounts vs medically transmissible virus amounts. This avoids that and is very much supported by other things I’ve read. I’ve also received a lot of presentations from senior medical officers of The Corporation and it doesn’t contradict anything being told to the company medical clinics.

covid19 aerosol transmission 

@fribbledom I wonder if this accounts for the new information that aerosols aren't as infective as droplets. It seems that the aerosols concentration effect might cover this, but ???

covid19 aerosol transmission 

@fribbledom This is really good. And also terrifying.

I keep thinking about the screens that places like restaurants put between booths and can’t help but think that they are mostly useless.

@wizardofosmium

covid19 aerosol transmission 

@fribbledom And our Australian politicians keep saying how schools are totally safe because kids don't get infected (even after schools are at the centre of several major outbreaks)

covid19 aerosol transmission 

@sphere_au

Here in Germany 10 to 20 year olds are currently - after the summer vacation - the highest risk group (not in total numbers, but per capita) 😐

covid19 aerosol transmission 

@fribbledom
Great article! Thanks for sharing

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