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Lazarus Long Profile picture
@LazarusLong13
Jan 5, 2022 • 10 tweets • 5 min read • Read on X
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A quick thread on why elastomeric respirators are better than N95's.

In short? Like N95/N99 disposables are better than surgical/cloth masks?

Primarily, fit. Not that fit 👇👇.

How it fits to your face.

For a number of different reasons that may surprise you.
First off, getting the respirator to actually fit to your face.

Not all facial geometries are the same.

The Fit Test Panels used to evaluate fit, I submit, do not have enough women or Asians.

Archived the pdf here:
web.archive.org/web/2022010510…

Study here:
tandfonline.com/doi/abs/10.108…
So, no surprise that with N95 disposables that 👇👇

High - level:
web.archive.org/web/2021082422…

Direct Study Link:
web.archive.org/web/2021020313…
web.archive.org/web/2021082422… Image
Do elastomerics fit easier? Yes - because of the elastomeric material (another way of saying 'rubber-like', but usually made of medical grade silicone.

So when comparing the two, we find a huge difference:

With 60 subjects from the ASA, 98% of elastomerics passed fit testing Image
versus 57% of disposables.

And the single failed fit test for the elasto's? She switched from a medium to a small and passed.

web.archive.org/web/2021020313… Image
In this next study:
jamanetwork.com/journals/jama/…

87% of participants had experience with elastomerics or disposables.

Only 1.3% had experience with elastos.

So, they were largely experienced at wearing N95's.
Yet, after watching just a 9 minute video, 92% were able to successfully fit the elastos's vs 88.5% in the N95's that they were experienced at.

Let's move on.

Speaking of movement, elastomerics keep their fit much better during movement.

Do you move during your job? Cook?
Clean? Do things as manually involved as CPR?

Then you will want an elasto.

In jamanetwork.com/journals/jaman…

N95's performance during CPR was poor. (Filtering Face piece Respirator 👇).

But elastomeric half-mask respirators' (EHMRs) performance was high.

This study confirmed Image
this next study, that CPR causes N95's to lose fit.

Their conclusion is stark and very real.

sciencedirect.com/science/articl… Image
Let's end on a light note.

Elastomeric respirators?

They let you keep fit and having fun!

With clean lungs!

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More from @LazarusLong13

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
Lazarus Long Profile picture
May 25
You've heard of "The Three Problem." - great book, and excellent Netflix series.

If you want to be avoid catching Covid, you probably have "The Empty Room" situation in the back of your mind.

How long after a room had people in it, can you safely demask?

Thread.
/1 3 body problem netflix cover showing a eye with a countdown running in it. That was a countdown to each person's death.
Measles was thought to be airborne after a child caught measles an hour after the infected child left the same office.

.

Interestingly, you can see the reluctance in blue below to call measles airborne. Much like the WHO with @mvankerkhove researchgate.net/publication/19…In February 1981, a measles outbreak occurred in a pediatric practice in DeKalb County, GA. The source case, a 12-year-old boy vaccinated against measles at 11 1/2 months of age, was in the office for one hour on the second day of rash, primarily in a single examining room. On examination, he was noted to be coughing vigorously. Seven secondary cases of measles occurred due to exposure in the office. Four children had transient contact with the source patient as he entered or exited through the waiting room; only one of the four had face-to-face contact within 1 m of the source patient. The...
which spent millions to rebrand SARS2 as "through the air" rather than airborne.

It is an inconvenient truth that then leads us to the study showing an #EmptyRoom SARS2 infection at 1 hour and 43 minutes, and FOUR HOURS and FORTY-FIVE MINUTES.

In this study, it comes with Experimental evidence suggests that SARS-CoV-2 remains viable within aerosols with a half-life of approximately 1-3 hours, though changes in aerosol microenvironment may shorten viability to minutes. However, it remains unclear how long airborne SARS-CoV-2 can transmit infection. Whole genome sequencing of nasopharyngeal samples obtained from patients on an outbreak unit suggested in-room transmission of the delta variant, AY3 lineage, of SARS-CoV-2 to two patients admitted 1 hour, 43 minutes and 4 hours, 45 minutes after discharge of an asymptomatic infected patient. These findings suggest...
Diagram showing 1 hour and 43 minute and 4 hour and 45 minute infections.
Read 30 tweets
Lazarus Long Profile picture
May 23
Mum's the word - if @SecKennedy is Mum.

You see, I have been a VERY FOCAL CDC critic. But you can't criticize without listening.

And I have been noticing that that the CDC has been very, very quiet.

NPR noticed as well. Image
This is crazy. Image
Yes, the @CDCgov has been deathly quiet.

90 times last year, versus 4 this year.

This is not MAHA.

This is MASA - Make America Silent Again.

And as one of the CDC's most focal critics? We NEED them to be sharing Public Health information. Image
Read 5 tweets
Lazarus Long Profile picture
May 1
Fit factor of 250- 4000 versus the normal 100-200 for an N95? Where do I sign up?

Oops, that's here. With me. Starting a build with an Ebay'd Bullard EVA PAPR's filter - and some DIY loving goodness of a heat gun and PVC pipes.

The benefit of this build will be the over 10
hour run-time of the massive battery on the PAPR.
Got a long dental appointment? This will be the answer.

Let's get cracking!
Read 32 tweets

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