Canada finally changes guidance that SARS-CoV-2 transmits in the air!

(Ignore the language about this being "new knowledge" etc that's just everybody saving face.)

Now get HCW all the protection they need because this isn't going away tomorrow ...
Lest there be any confusion at all, this is an excerpt from a 1980s article citing back to the 1930s/40s that measles was proven to be in the air. So no, this is not new. And in relation to coronaviruses, animal coronas were known to be in the air, and SARS and MERS suspected
And of course this needs to be reflected in HCW precautions, which still reflect droplet + N95 for aerosol-generating procedures only

canada.ca/en/public-heal…
Finally we've been copying Japanese messaging for months, without any explanation as to why

So finally, we are one small step along the way to explaining to people why on earth we are asking them to do things that would ONLY be applicable to aerosols floating in the air

Hurrah?
The whole brochure.

mhlw.go.jp/content/109000…
From NHK, April.
From 2018. Note the number of viruses for which there was data (center column) or transmission GUIDELINES (right col) that suggest aerosol

SARS and MERS on the list

Guidelines are going to tend towards conservative "droplet" mode, so the fact that so many say aerosol is telling

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More from @jmcrookston

3 Nov
@jljcolorado @kprather88 knew I posted it somewhere. Just a quick tag as reminder.

So "droplet" = "airborne across to next bed" maybe?

Hmm ...
Chapin said this and he was very fond of droplets because he felt they "made sense".

Not because he proved them but because he saw most transmission at short range.
Droplet is truly just short-hand for "aerosol infection that happened at short range".

(Other than a rare case where somebody actually sneezes into another's face.)
Read 8 tweets
3 Nov
Norwalk disease causes vomiting which may launch millions of virus particles into the air, perhaps causing its explosive attack rate of over 50%.

Lancet.

1994. Image
Image
Image
Read 11 tweets
31 Oct
In summer 2020, the WHO wrote an article to support droplet transmission of COVID-19.

What if I told you that it went horribly awry, and actually helped prove aerosol?

Good news!

Have I got a thread for you!
In summer 2020, the WHO committee that sets COVID-19 transmission guidelines wrote a piece.
It argued for droplet, and contained many misconceptions and logical errors that have been dealt with elsewhere. I won't get into those.

Read 13 tweets
30 Oct
Just posting the charts from the presentation referred to in this article.

Toronto:
Peel
Ottawa
Read 5 tweets
14 Oct
@DavidElfstrom @skeila @WHO @ottawahealth It _is_ ridiculous.

Let's call a spade a spade.

They owe me a single peer-reviewed study of contaminated masks hurting someone.
@DavidElfstrom @skeila @WHO @ottawahealth Meanwhile the WHO committee is busy suggesting that we ought to tell HCW about the harms of N95 marks.

Conly et al. from summer. ImageImageImage
@DavidElfstrom @skeila @WHO @ottawahealth Doing this on the fly. Here's their cite to the harm of respirators. Image
Read 17 tweets
11 Oct
Guess I'll just do a quick post about this.

Remember back in early 2020 when everybody was saying maybe masks would work to stop the spread?

But certain people said nah, masks don't work.
Well back in 2015 a hospital wanted HCW to vaccinate.

To encourage vaccination, they implemented a policy that if the HCW did not vaccinate, they had to wear a mask for their entire shift.
Unfortunately when it went to arbitration the hospital had then to justify its argument that masks stopped outbound transmission (source control).

Case is here. Appendices are full of references about masks, including working for source control.

canlii.org/en/on/onla/doc…
Read 6 tweets

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