AGMPs don't necessarily produce aerosols.
It's just an old talking point that keeps getting repeated. It comes from the PROCEDURE bringing MANY HCW into the room for intubation. Plus the idea of drops flying out of mouths when you intubate.
Another:
Their discussion:
1/3 Smart people on this team
2/3 They found 19 procedure types might be higher risk
... for many others they couldn't find good evidence.
3/3 ... and noted that some procedures might simply trigger coughing, which itself creates aerosols.
Feel free to continue the search ...

ncbi.nlm.nih.gov/pmc/?term=aero…
1/2 Never mind I did.

No large additional risk from AGMPs here, but authors felt a hierarchy might be appropriate:
2/2
1/3 Hard to measure AGMPs really
2/3 Bronchoscopy didn't increase, really, but there were peaks exposures.

Conclude, we don't know if it's the AGMP, touching counter, or that they screw up taking off their masks, really.
3/3 from this.

Read yourself pls to check my very very quick skims here.

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More from @jmcrookston

3 Jan
1. Nope. It's in the air. So it's "airborne". That's the English word for it and it works.

We can be done with this stupid definition of "airborne" from the 1800s that even epis don't understand.

2. Virus moves like smoke, too. Don't blow a gasket.

#COVIDisAirborne
"Airborne" just meant spreads outside about 3 feet to epidemiologists in the late 1800s and early 1900s.

1. SARS-CoV-2 pretty obviously meets even that definition

2. Anyway we're just using the regular English word not your word. Don't be upset.

#COVIDisAirborne
Once we finally solve this terminology, they're gonna have another problem, which is that all these viruses are "airborne" and we just see longer-range transmission amongst the more contagious/in odd situations.

So they're gonna have a chance to make up more words soon anyway.
Read 12 tweets
2 Jan
Self-inoculation by touching a contaminated mask.

1. We don't know if people get sick from touching masks.
2. We don't know if HCW touch masks and get it on their fingers. (We can use models to estimate though.)
3. But when we do, the transfer efficiency is basically nothing. (Very little pathogen transfers.)
Read 10 tweets
2 Jan
*At the current rate, 80% of Ontario adults will be vaccinated by June 2040.
Oh, hey, by the way, Israel vaccinated 650,000 people in nine days (out of 9.2 million).
Read 6 tweets
1 Jan
Sign the petition to promote recognition of airborne transmission of COVID-19!

Now translated into many languages:

bit.ly/CiA - English
bit.ly/CiA_es - Español
bit.ly/CiA_it - Italiano
bit.ly/CiA_pt - Portuguêse
bit.ly/CiA_fr - Française
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bit.ly/CiA_ru - Russian
bit.ly/CiA_ukr - Ukrainian
bit.ly/CiA_kz - Kazak
bit.ly/CiA_th - Thai
bit.ly/CiA_ae - Arab
bit.ly/CiA_ir - Persian
Read 4 tweets
26 Dec 20
Here is part of the problem. From a textbook published in 2015, the chapter on RSV. This is just an example.

Says aerosol not likely, citing author's own paper from 1981 (35 years ago).

Says fomite important (touching objects...). Cites nothing.
This similar kind of citation for fundamental principles feeds into papers.

Pic from a paper from 2019. Cites a text book chapter from 2003 and two more papers from same author as earlier, from ~1981. All for the prospect that RSV transmits by touch, only.
The 2003 text book is 5. The other two are 6 and 7.

5 cites to another 1980 paper. Probably one of the 6 and 7 papers.
Read 12 tweets
7 Dec 20
Reminder that SARS-CoV-2 has infected people who entered a space AFTER the index patient left.

So is it msgic like measles yet?
Here. A0 and B1 shared an elevator, but NOT at the same time.

Hunan bus from April. Purple got on bus AFTER index left. China CCTVs every bus so they could track this.

In North America we just say "touched seat back" because we're stupid.

Read 5 tweets

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