Lazarus Long Profile picture
Jun 5 13 tweets 6 min read Twitter logo Read on Twitter
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…

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More from @LazarusLong13

Jun 5
The flu is airborne. So, we can now say Airborne Alzheimer's. (Remember how the flu was severely reduced by masking and other NPIs?)

Now, we can see that Airborne Alzheimer's is reduced by 40% with even just one flu vaccination.
Know what else is airborne?
Dementia.

Because the shingles vaccination led to a 19.9% reduction of dementia. Shingles, of course, is from chickenpox - varicella-zoster virus (VZV), from the herpesvirus group.

And chickenpox is well-known for airborne
medrxiv.org/content/10.110… Image
We can also say that in all likelihood that lupus is airborne.

Read 5 tweets
Jun 4
A Covid Math Word Problem.

If a 52-year-old male patient, without comorbidities, with three doses of vaccines against COVID-19, gets infected by Omicron.

How long until he can get infected again?

Answer next tweet.
16 days.

By two divergent VOC Omicron sublineages, BA.1.1 for the first round, and BA.2 for the second.

Second Covid Math Word Problem.

If you have a 10% chance of LongCovid on the first infection, and 20% on every reinfection after that - how long until you have LongCovid?
Assuming you keep getting infected over and over?

Answer next tweet.
Read 6 tweets
Jun 1
THE DIY HOOD HEPA.

One of my favorite concepts that you can DIY at home if someone gets Covid.

Top ventilated HEPA. (Really can just change how it's taped up, so even side exhaust will work. Even a CR box could be used (albeit single or double filter version).)
Duct tape.
PVC. Image
Add that up and you get drastic reduction of Covid floating in the air - AT THE SOURCE.

I spotted this in other studies long ago, but this version is from here:

@SimonAJoosten1's study, linked next tweet. Image
Read 5 tweets
May 31
@PaulSaxMD - thank you for the excellent write-up on Loeb at al (2022).

I have a separate criticism from an aerosol perspective. Loeb had donning and doffing at 3 feet.

A surgical mask is not actually Respiratory Protective Equipment (NIOSH) due to not being fitted.
/1
So its effectiveness will not be as diminished as much as an N95's.

Donning am N95 after walking into a room where an unmasked patient has been even just breathing? And donning at only 3 feet away?

An asbestos abatement technician would be fired.

Would a BSL3 lab worker
don at only 3 feet away from a infected participant in the lab?

This is what we have to assume happened as this was the method documented in Loeb 2022- and 2009.

Read 4 tweets
May 31
Influence the CDC and influence the world.

Influence the HICPAC, and influence the CDC.

I'm hoping some high-level names will comment because they are pushing for surgical masks for "seasonal coronaviruses" and the flu.

@brosseau_lisa @HuffmanLabDU
their position.

If I may be so bold as to point out? Both studies had donning and doffing at 3 feet.

2022 with Covid, also required a fever or cough.

2022 - Supplemental Section
acpjournals.org/doi/suppl/10.7…

Study Protocol, Section 2.3
acpjournals.org/doi/suppl/10.7… ImageImage
Read 9 tweets
May 31
Making the case for the #CorsiRosenthalBox with studies.

A simple thread.
"no U.S. Energy Star certified air cleaners have CADR values (for either tobacco smoke, dust, or pollen) matching the CADR value for the CR Box even on low speed "

On cost? 1/10th.

1019 to 1444 m3/hr CADR.

(600 to 850 ft3/min)

Published here:
tandfonline.com/doi/full/10.10… ImageImage
An incredibly thorough study published in February 2023, with all of its authors from @NIOSH.

With universal masking in a 3-ply cotton mask, exposure to the relevant aerosol size is reduced by 88 to 94%, with the #CorsiRosenthalBox.

73% w/ CRBox alone.

sciencedirect.com/science/articl… ImageImage
Read 21 tweets

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