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Lazarus Long Profile picture
@LazarusLong13
Jun 5, 2023 • 13 tweets • 6 min read • Read on X
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H/ T @healthyheating for a VERY cool study!

Robot babies, Covid, and resuspended aerosols!!

Hang onto your nappies, kiddos - it's a good old Tweetorial 🧵 with a pay to play study. So, free!

TLDR? Vacuum your carpets, and run the most air cleaning filtration you can afford Image
"We are perpetually surrounded by a cloud of self-induced resuspended particles, referred to as the".... Pigpen effect (my thread, my word, Pigpen).

It is on the order of smoking in terms of particulate rates emitted. twitter.com/i/web/status/1…
Infants can travel up to 20 football fields during a day, with a path as crazy as a cat zigzagging through a room full of Roombas.

If we can kick up our own dust, you would think infants could. And that's what they set out to measure. twitter.com/i/web/status/1…
That dust cloud is a mix of chemical and biological stuff. Like living and dead microorganisms such as bacteria. Biological excretions like animal and mite allergens.

And PFAs, phthalate plasticizers, and flame retardant.

And might include toxic metals like lead. twitter.com/i/web/status/1…
So, they put together a robot infant and ran her over 12 carpets methodically.

And when I say methodically, I mean it.

In the Methods section, there is a link

(I made the mistake of starting this thread last night. Chuckie, below, made his appearance in a nightmare.) ImageImage
that Adobe Acrobat is not letting me grab from the PDF. So, here is where you can find it.

Aerosol and airborne nerds will want to.....fascinating! Image
When the baby started crawling, there was a significant increase in airborne particle concentrations, right where it would breathe those particles.

1.5 and 4 μm size particles? Possibly bacteria and fungal spores.

>6 μm - thought to be biological in origin.
Now, a truly interesting nugget?

When we walk, our personal cloud gets mixed pretty quickly into the overall room air.

Nobody puts Baby in a corner - but they sure put her into her own little cloud.

Because her crawling is not enough to mix that little cloud of resuspended ImageImage
particles.

Another interesting nugget - older, cheaper carpets, counter-intuitively, might be better for Baby. Image
Finally, were the particles inhaled?

Absolutely - see below.

If SARS-COV-2 was brought in on your shoes? It could be kicked up by the baby. Of course.... Image
the most likely source for those Covid particles are from us breathing them out, and then settling on the floor.

So, how can we help our floors stay cleaner?

Vacuuming, of course, but also by cleaning the air with HEPAs and #CorsiRosenthalBoxes (👇).
I strongly encourage you to go read the study yourself as it is methodically well-done.

And just a darn good read!

Here it is, free. (Click the blue button, "Open", on the right.)

sci-hub.hkvisa.net/10.1021/acs.es…
Oops...forgot to H/T for the gif - thank you!

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More from @LazarusLong13

Lazarus Long Profile picture
Jun 1
A thread on airborne Ebola - the rest is accurate.

Let me emphasize that I agree far more than disagree with her, in general.

Declaring a thing debunked without actually debunking it, with facts, is not debunking.

So, let me debunk this. Image
Dr. Kuppila has excellent credentials, and has earned her laurels.

If we accepted the debunking of airborne Ebola on the basis of credentials, we would have given into the fallacy of appeal to authority.

:) not today.

She worked in an Ebola Treatment Unit in Sierra Leone,
coming back in December 2014, and now resides in Dallas per her very interesting StatNews article:



She did not get infected. We could have survivorship bias here - fortunately.

This is a reference to possible surgical mask usage by her.

You see, the web.archive.org/web/2026052103…Image
Read 22 tweets
Lazarus Long Profile picture
May 28
Ebola - it's not all about respiratory aerosols.

DYK that you, and me, and everybody are Pig Pen from Charlie Brown?

We shed our entire outer layer of skin every 2-4 weeks, about 500 million cells daily.

Your corneocytes (outermost cells) lift off of your body with the
gentlest of micro-air currents. Like a leaf picked up off the ground for the briefest of moments in fall.

They act like 12 micron aerosols in float time, but 25% of total skin flakes are sub 5 microns...and you know what that means. Deep deposition - or shallow as
sub 5 likes to also deposit in the nose.

It's funny...I embrace push-back in debate. Tightens up my game.

Imagine if those skin flakes now have Ebola on them?

Two studies show that Ebola literally oozes through the skin - both ways. In and out.

Not shown in vivo, but
Read 10 tweets
Lazarus Long Profile picture
May 23
The WHO forbids contact tracers from masking or gloving up.

"Do not conduct home visits wearing personal protective equipment like masks, gloves, or
gowns."

It gets worse. Do not conduct home visits wearing personal protective equipment like masks, gloves, or gowns.
They have a handy how to reduce risk of catching ebola at home.

It even has 5 masks listed on it.

But not for the other family members.

"7. If the patient has vomit, diarrhoea or bleeding, a mask or a dry towel wrapped around the face can be used to protect the nose and mouth Image
7. If the patient has vomit, diarrhoea or bleeding, a mask or a dry towel wrapped around the face can be used to protect the nose and mouth when touching the patient or items soiled with blood or body fluids. A waterproof gown, eye protection, gloves and rubber boots should also be worn in these circumstances.
Here are the 5 face masks. Image
Read 9 tweets
Lazarus Long Profile picture
May 22
The "epidemiology" of Ebola tells us that it's not airborne. You've heard this over and over.

What drives it? The questions on the contact tracing form.

Quick 🧵. Image
COVID - the WHO and CDC said it wasn't airborne via aerosols, right?

The CDC said it was spread person to person via close contact - within about 6 feet.



And you remember it took FOREVER to get changed.

The contact tracing form was web.archive.org/web/2020032817…Image
Image
arranged around close contact. These are the questions driving the stats of how many and how are infected.



So, the CDC will only hear back what it's asking. This was the epidemiology of COVID - until it wasn't. web.archive.org/web/2020052514…Image
Read 16 tweets
Lazarus Long Profile picture
May 20
Speaking of silly, can we agree that the WHO has Ebola experts?

Let's talk about PPE, and a bias towards "less PPE is better." Image
The WHO EBOLA IPC guidance:


Foreshadow on PPE

"...due to the desirability of an off-
the-face design, and not for protection from aerosols, respirators may be used instead of medical masks"who.int/publications/i…
If you can stay 3 feet away while screening? No medical mask needed. Image
Image
Read 12 tweets
Lazarus Long Profile picture
May 10
Great article by @EmilyJoshu here.

Emily, there's another article in this that's even more shocking.

The aerosols from milking have long been discussed by many of us on X.

People like myself, @sri_srikrishna, @AbraarKaran have long advocated for comfortable aerosol
protective gear like PAPRs. But, have been ignored by the USDA who, of course, thought it was only contaminated milking gear like the claw.

But there is one more source of aerosols besides cow breath.

The wastewater. When you spray anything you generate huge amounts of Image
aerosols. And that farm wastewater, filled with milk dumped from being full of H5N1, gets reclaimed and reused.

Those milk and wastewater lagoons are on most dairy farms (my grandfather owned a dairy farm).

And there's something you should know.

Image
Read 15 tweets

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