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Lazarus Long Profile picture
@LazarusLong13
Nov 4, 2022 • 11 tweets • 5 min read • Read on X
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An Official Conference CoVid Mask Rater Thread: #2022ASA

These folks get a 9.5/10. Period.
A presenter in a respirator? What?!
More folks in respirators?! What!? So confused...The Public Health conferences never looked like this!?
@AmerStudiesAssn is swinging for the fences!

Respirators only, please!
theasa.net/about/news-eve…
Receptions outdoors? Can one fall in love with a conference? Pitter patter.

No one but us transmission prevention specialists know that transmission can still happen outdoors. But. Super-spreading is bloody well much less likely to happen.

So kudos.
Testing with 24 hours of conference start?
Rapid testing? Every day?!
"Have the bivalent boosters - or you are dead to us.".
A personal attestation....love to see it!

Would have loved to see #corsirosenthalboxes or HEPAs involved. Headband N95s instead of KN95s (60-70% fake on Amazon), as those earloops slowly ease forward.

And of course, having virtual - but they went out of their way to talk about that...this entire clip is about it.
So, not perfection, but you can tell they are trying, and have done a fine job.

And that's 1000% better than some of the others we've seen.

Over a year's worth of conferences:

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More from @LazarusLong13

Lazarus Long Profile picture
Jul 17
So, I got curious.

Despite the pore sizes of the N95 filtration being so much larger than CO2 molecules, there is a greater concentration of CO2 in the N95, than outside.

Why?

We exhale 4–5% CO2 (40,000–50,000 ppm), much higher than the ~0.04% (400 ppm) in ambient air. Image
What is the the AVERAGE CO2 in the dead space below an N95? 1-3% - or 10,000 to 30,000 ppm.

Sounds scary high, right? It's the AVERAGE. Below you can see it rise and fall. See how at the end of the inhalation it's almost zero?

But what happens to that CO2? We inhaled it Image
all, so we must be poisoning ourselves!?

Nope, here is what is going on with our alveoli gas composition.

Not much of a change.

And that gets reflected in the amount of CO2 in our blood.

That is best measured by PaCO2 (arterial CO2 partial pressure). Image
Image
Image
Image
Read 17 tweets
Lazarus Long Profile picture
Jul 15
Are you reading this thread because you said you were worried about CO2 in an N95?

Hypercapnia?

1. Don't worry - be happy. This thread explains why you should not be worried about those things.

2. If still worried? We'll get to what YOU can do about it.
In 1998, long before the mask controversy of 2020, the OSHA Respiratory Protection Standard was passed.


Cntrl F for
"carbon dioxide", "dead space", or "physiological burden".

Before they passed it, they consulted industry, unions, academic researchers. osha.gov/sites/default/…Image
Image
Image
Image
Dozens of studies addressing CO₂ buildup, dead space, and other tolerability issues in respirators.

Seriously, Cntrl F above.

But there is a long history they built upon within NIOSH AND OSHA - AND before.

Timeline
cdc.gov/niosh/about/ti…

Great video
youtu.be/qZEf-tzko0A?si…
Read 36 tweets
Lazarus Long Profile picture
Jul 13
Tired: Infectious fecal and respiratory aerosols.
Wired: Infectious urine aerosols.

Do you know how many aerosols you generate at the urinal, standing up?

Do you know how many aerosols you generate on the toilet, sitting down?

Do you know you have a thermal plume lifting
both up to your breathing zone?

Do you know that you can get an N95 at Home Depot or Lowes - and you can wear it into their public restrooms?

Studies to come to avoid the Musk Masking algorithm.
Infectious, cultured urine from a patient:
tandfonline.com/doi/full/10.10…

standing thermal plume
link.springer.com/article/10.100…

sitting thermal plume
journals.sagepub.com/doi/abs/10.117…

flushing generating aerosols:
youtube.com/watch?v=elieor…

study on flushing generating aerosols
link.springer.com/article/10.100…
Read 5 tweets
Lazarus Long Profile picture
Jun 8
"COVID IS OVER, YOU DON'T NEED THAT!"

Reason 4,657 on why I mask now that I understand aerosols and transmission. It's not all about COVID.

This is Chicago, but it's really Anytown, USA. Image
"The human DNA virome. Prevalences (%) of viral DNAs in the body (≥1 tissue positive for a virus) and in different organs as determined by qPCR or NGS"

researchgate.net/figure/The-hum…

x.com/AbundantLandUs… Image
.Why I mask in more details...

EV-D68. An enterovirus - many people think enteroviruses are strictly fecal-oral.

They think wrong ( this is not a subtweet at Dr. Johnson).

Read 6 tweets
Lazarus Long Profile picture
Jun 7
How do we know TB is airborne?

71 guinea pigs gave their lives between 1956 and 1958 in the eponymous study by Riley et al, getting TB air piped in from some TB patients, to prove TB is airborne.

Influenza is kind of airborne per most doctors. But kind of not.

So....

/1 Image
We need some volunteers.

Will horses be those volunteers that finally lay it all out?

Yes - but none of them lost their lives.

Air samplers were deployed and tracked horses inoculated with Equine influenza virus (EIV).

From the very first day post inoculation (dpi), until the Image
12th day, EIV was found in the air, in this new study.

With no horses, or guinea pigs, hurt in the process.



But sure, influenza's not airborne - if you are the USDA, right, @nirav_maine?

Of course, yet another new study points an accusatorysciencedirect.com/science/articl…
Read 9 tweets
Lazarus Long Profile picture
May 26
Thank you @BarryHunt008 for flagging this.

@ThailandMedicaX, retweeted by some because of their controversial takes (ahem, their lies?), is saying that FAR-UVC is dangerous because somehow the light will get into the lungs.

Lol.

They are just apparent supplement grifters.

🧵 Image
I noticed they were using @NukitToBeSure's excellent torches as their example picture.

Strange to be so selective of an example picture for someone purporting to be an independent news source on health.

Hmm. I helped defend Nukit against charges of Image
racism by a very nasty couple who it turned out just do not like UVC, personally. I wonder....

Yep, ThailandMedicalX has blocked me.

But, it's weird for a purported news source to block someone like me @gorskon
@doritmi @19joho.

And them blocking me, is probably because Image
Image
Read 21 tweets

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