Lazarus Long Profile picture
May 17, 2024 36 tweets 14 min read Read on X
This is a 🧵 that cuts through this CDC school guidance like the thread used in Netflix show "The Three Body Problem."

Their guidance will cut down the kids just like were cut down in the show.
Let's start with their tweet. It provides a framework to evaluate their actions against their words.

- preventing spread of infectious diseases.
-benefiting ALL students.
-maximize school attendance.

Let's start with preventing spread.

-Maximize school attendance
While preventing disease
Benefits all students is highlighted
The single most efficacious way to prevent the spread of infectious diseases is wearing respirators, as they stop both near and far field aerosols.

Are they mentioned in the intro page linked to? No. Masks are, but are buried.

People are logical.
cdc.gov/media/releases…

Teach and reinforce proper hand washing and respiratory etiquette. Take steps for cleaner air by improving ventilation in schools. Schools should consider ventilation enhancements and design when undergoing remodeling or when undertaking new building construction to optimize clean air. Clean, sanitize, and disinfect, when appropriate. Promote vaccinations for students and staff.
Long red arrow showing way down the page where masks are buried
They do the bullet points first.

Masking is not even in the bullet point sections.

PPE is in the 2nd group- for staff taking care of sick kids. Of course, this ignores the 58% presymptomatic transmission rate for SARS2, 38% for influenza.

Masks for kids are buried in the
"If illness activity is elevated, schools can consider implementing additional strategies"

section. Look at the action words...

Schools CAN CONSIDER implementing additional strategies.

Whoa! Your principal will be RUNNING to implement mask mandates. (Not mentioned). Image
"These additional strategies depend on several considerations, but include actions such as:"

What considerations? This is just such bad public health writing.

You don't say "there are several things" - and then not actually talk about those things. Image
Wearing masks are included with increasing space and distance between students and cohorts.

Really? The ONLY time that has been used in the US was during pandemics. (This does not include whole school closure for temporary outbreaks). Image
So, prima facie, the most effective NPI (NonPharmaceutical Intervention) is only listed in the pandemic section. And not even an effective version, masks, or the fact that mask mandates are necessary for wide uptake.

Especially in schools which are EVEN MORE subject to peer
pressure than adult society. (Mandates work by removing peer pressure).

But hey!

You can applaud the CDC because they actually mentioned the word masks.

✅ Everyone applaud the CDC for dropping the word into a page

You can. Not me.

Let's move on. Maybe it gets better? Image
Intro page here, but let's look at the quick (the fact) sheet



"Fact Sheet: Help Your Child’s School Prevent the Spread of Infections"



No masks found. Not in the pics.... cdc.gov/orr/school-pre…
cdc.gov/orr/school-pre…



Image
Image
Image
Image
Not in the words

Instead it is respiratory etiquette, which....

Image
Image
Image
does not work.

Do little fingers magically stop aerosols from spurting from between them?

No. Neither do elbows.

And we DO NOT USE RESPIRATORY ETIQUETTE when WE BREATHE.

The @CDCgov is being so STUPID on this point.

In between the coughs? We all

still breathe. And we breathe about 11,000 liters of air every day.

A cough is about 2.3 liters of air. That is 5,000 coughs per day for respiratory etiquette to be used - if it actually worked, which it doesn't.

RESPIRATORY ETIQUETTE DOES NOT PREVENT OR SLOW TRANSMISSION.
But it is part of their main page to prevent or control the spread of infection.

cdc.gov/orr/school-pre…

Everyday Actions for Schools to Prevent and Control the Spread of Infections
School Preparedness Everyday Actions for Schools to Prevent and Control the Spread of Infections PAGE 2 of 10 ‹View Table of Contents  This guidance is for general school settings. Healthcare workers in school-based health clinics or nursing offices should follow guidance for healthcare settings.  Everyday actions help keep students healthy by minimizing the spread of infections in school settings. Infections spread in schools because of shared objects, close contact with others, students playing closely together, lack of cleaning and disinfection routines and supplies, and lack of proper v...
As is Handwashing and Cleaning, Sanitizing.

Let me ask you a poll on this topic
Hand Washing Children washing hands at school Washing hands in school can help prevent the spread of respiratory and gastrointestinal diseases. Teaching and reinforcing proper handwashing can lower the risk of spreading diseases. Schools can set routines or scheduled opportunities for handwashing throughout the day. During times of increased illness spread or absenteeism, schools can evaluate hand hygiene routines and increase those opportunities. Schools could monitor and reinforce these behaviors, especially during key times in the day. Additionally, schools can provide adequate handwashi...
that are visibly soiled with blood or other body fluids. Use gloves and other personal protective equipment (PPE) as warranted to avoid contact with the fluid. Wipe or soak up the blood or bodily fluid, clean, and then disinfect the surface. For more detailed information, see Cleaning and Disinfecting Your Facility.  Rarely, a school might need specialized or enhanced cleaning and disinfection for a particular infectious disease. This can occur when a new pathogen emerges and an ill student has been in the school space or an outbreak occurs with a specific pathogen like norovirus. Schools s...
Do we magically ooze viruses through our skin?
WHERE DO PATHOGENS PRIMARILY COME FROM?

Our mouth, nose, and anal orifices.

The anal orifice is covered by underwear and pants. A cloth mask.

The mouth and nose are not covered.

So, AFTER you wash and clean? Guess what gets dirty again from the uncovered mouth and nose?
Taking Steps for Cleaner Air leads off that page. Great. But masks should lead it off.

Oh SACRED BLEU! How dare I say that?

Ever hear of a hospital? Yeah, they have GREAT ventilation and filtration.

And they are still infecting lots of folks.

In fact, when you Take Steps for Cleaner Air Person opening window Improving air quality can reduce the number of germs in the air by increasing airflow, cleaning the air, or moving gatherings outdoors. Cleaner air can reduce the likelihood of spreading disease, particularly respiratory viruses. See CDC’s Ventilation in Buildings webpage for information on how to improve ventilation in a school.  Strategies that can be implemented to have cleaner air include:  Ensuring existing HVAC systems are providing the minimum outdoor air ventilation requirement in accordance with ventilation design codes. Considering ...
take the same hospital and put in place universal masking? Infection rates go down.

And this is part and parcel of what the CDC recommends for all of our hospitals.

But not for our schools, WHICH HAVE WORSE VENTILATION.

(Vaccinations also on this page...good ).
Let's jump to the actual page with masks. Sorry, the Additional Strategies page.

Mandates are not mentioned. Despite that being one of the CORE lessons we have all learned is crucial.

Back when Biden first began to demask America?

cdc.gov/orr/school-pre…
Image
Masks had 84% or so support. But 84% of America sure wasn't masking.

👇 Masks recommended - as only an antimasker could recommend them.

Kids don't wear N95s in general. So, next best- KN95s? The counterfeited KN95s from Amazon?

You would think the CDC would mention KF94s, Cloth masks generally offer lower levels of protection to wearers, surgical/disposable masks usually offer more protection, international filtering facepiece respirators (like KN95 respirators) offer even more, and the most protective respirators are NIOSH Approved® filtering facepiece respirators (like N95® respirators).
from Korea with their much better regulatory process.

And most of all ? Why not mention elastomeric respirators for kids?

DISPOSABLE RESPIRATORS (N95, KF94, KN95) LOSE FIT!

Sure, @flo_mask is the best game in town for elastos in town, but at least mention the genre.
I assume someone from the @CDCgov reads the NYTimes?

web.archive.org/web/2024012403…


Image
Image
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The CDC goes on to recommend possibly adding masking to anti-bullying programs - acknowledging the issue with not having mask mandates. While not mentioning the word.

And a bit later, they point out that immunocompromised children should not be segregated...while ignoring the
Image
Image
fact that not having all in masks? Segregates those in masks.

These CDC guidelines are a touch better than what they had before, but it not only continues to hurt the kids? But the CDC and public health.

/Continued... Image
Which brings us to maximizing school attendance.

THE NEW CDC GUIDELINES WILL NOT MAXIMIZE ATTENDANCE, and hurt the public's view of the CDC.

That's right - the CDC is hurting public health. Hurting themselves. Hurting the kids. Hurting America.

With this guidance.

/Cont Image
I will say /fin when done.

Will infectious disease transmission be reduced by the new guidance?

Well, they already had handwashing, cleaning, sanitizing, formally before.

Ventilation was already there before, informally, thanks to Covid.

And infectious disease transmission
has only gone up since the end of public health emergency.

RSV, influenza, etc.

The Zeitgeist has Americans feeling constantly infected. Reddit, Facebook, x/Twitter, etc .

And this new guidance was already in place.

Let's take a simple example, "Jack and Diane".
They see the CDC guidelines. They think, "Yay! The CDC is stepping in to help keep Burt and Ernie from being sick nonstop."

But Burt and Ernie keep getting infected because nothing amhas actually changed since the end of the PHE.

Will Jack and Diane look favorably upon
public health? Or are they more likely to think, "Hey - maybe it IS the vaccines making our kids sick."

Because they already knew their kids school HVAC had been improved.

It is truly ironic that the CDC continues to hurt public health.

While trying to help public health.
I almost forgot to close out on the maximize attendance point.

The CDC is "trying" to maximize attendance. This ostensibly is to be done by preventing the spread of the flu, norovirus, strep throat.

Interestingly, covid not mentioned there.

And even more interesting?
Image
Image
All of those are airborne. But as Covid has shown, near field aerosol dominates transmission of airborne diseases.

The CDC is putting fomite and far field aerosol strategies at play.

MASKING is the THE near field aerosol NPI, and is shoved into the back of the closet.
(Note: far field improvements will result in small improvements in near field. Distancing as listed in Alternative strategies is also a near field aerosol NPI)
By ignoring the PRIMARY form of transmission in their HIGHLIGHTED NPIs?

The CDC WILL NOT MAXIMIZE ATTENDANCE.

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More from @LazarusLong13

Dec 21, 2025
Oh, we are cooked. Just cooked.

"Brain Mitochondrial dysfunction, known for ~20 years is finally recognized as a central upstream driver of Alzheimer’s disease (AD), not just a downstream effect."

And SARS2's targeting of mitochondria is well-known.

Even in the brain.
/1 We identified dysregulation of mitochondrial and synaptic pathways in deep-layer excitatory neurons and upregulation of neuroinflammation in glia, consistent across both mRNA and protein. Remarkably, these alterations overlapped substantially with changes in age-related neurodegenerative diseases, including Parkinson’s disease and Alzheimer’s disease. Our work, combining multiple experimental and analytical methods, demonstrates the brain-wide impact of severe acute/subacute COVID-19, involving both cortical and subcortical regions, shedding light on potential therapeutic targets within pat...
@LauraMiers, in case you don't have it.

nature.com/articles/s4358…
@LauraMiers This is yet another reason why I N95.

Read 6 tweets
Dec 17, 2025
@neiljshaw - — a few tips on your excellent article from a clean air advocate

"Consider Wearing a Mask" ?

No, "It is incredibly important to wear a well-fitting mask such as a N95, KN95, or KF94, for the best protection."

You two are doing Image
public health with this article.

Public health is best done with simple clear instructions.

No:
"These masks act as a barrier, reducing the spread of respiratory droplets when people talk, sneeze or cough."

Yes:
"These masks act as a HEPA air cleaner for the face,
cleaning the air of respiratory aerosols when people breathe, talk, sneeze or cough."

The barrier carries the idea of an immovable wall. Unable to be penetrated by things like oxygen and CO2 - which feeds antimaskers.

As an who debunks antimaskers, it is
Read 9 tweets
Dec 11, 2025
As an anonymous clean air advocate, I've put a bit of thought into how to present, well, my expertise.

If someone were to say, "How do I know you know what you are talking about? Are you a doctor, or a virologist?"

To which, I would say...."No, but that's a good thing.
/1
I have focused on aerosol and masking science. Because it is those fields that give us the most information on how airborne particles, aerosols, get from Person A to Person B.

My expertise is derived from the great studies of Dr. Lindsay Marr, MacArthur recipient. Dr. Prather,
double National Academy member, Dr Milton, inventor of the Gesundheit, aerosol scientist and medical doctor; Dr Coleman whose group found that duckbill N95s captured 98% of emitted respiratory aerosols, and more excellent individual aerosol scientists.
Read 17 tweets
Nov 22, 2025
I am not a fan of nasal sprays to stop The 'Vid, but I respect you having it as a layer in the Swiss cheese package.

But, some people have said they got bloody noses.

While at the ER yesterday, I picked up a pretty good at home technique. Let our $1,000 lay-out
Image
save you money.

Use tongue depressors to make a nose pinch clamp.

Leave it on for 30 minutes. Still a problem? Two sprays of Afrin, and re-apply nose pinch clamp. Wait 30 minutes.

Still a problem? Cotton balls sprayed with Afrin, clamp, 30 minutes

aliem.com/trick-of-trade…Image
Image
Image
Afrin- in generic form is $3.32 at Walmart.

Also, put a ice compress at the back of the neck, while doing the above.

"Cooling the nape of the neck is said to induce reflex constriction of the mucosal vessels of the nose"

✅ I agree with the authors.

pubmed.ncbi.nlm.nih.gov/1568881/Image
Image
Read 6 tweets
Nov 13, 2025
A study demonstrated 100% PERFECT protection against SARS2 w/ readily available KF94s

✅ 181 HCWs
✅ 1 got SARS2 antibodies, but an epi investigation -> the infection happened elsewhere.
😡 The final checkpoint was March 2021. N95s only became freely available 1 month later
/1 FDA: N95 masks, now plentiful, should no longer be reused  By MARTHA MENDOZA and JULIET LINDERMAN  (Associated Press)  April 23, 2021 12:44 p.m.  Medical providers may soon return to using one medical N95 mask per patient, a practice that was suspended during the pandemic due to deadly supply shortages
What is described in the tweets
in the USA.

Korean study:
jkms.org/DOIx.php?id=10…

This is in comparison to a Swiss study during the same rough time-frame. A study which did NOT show the same excellent results, but dismal results. Why?

The Swiss had the same sort of fit testing,

pubmed.ncbi.nlm.nih.gov/35123572/ Results: We enrolled 3259 participants from nine healthcare institutions, whereof 716 (22%) preferentially used FFP2. Among these, 81/716 (11%) reported a SARS-CoV-2-positive swab, compared to 352/2543 (14%) surgical mask users; seroconversion was documented in 85/656 (13%) FFP2 and 426/2255 (19%) surgical mask users. Adjusted for baseline characteristics, COVID-19 exposure, and risk behaviour, FFP2 use was non-significantly associated with decreased risk for SARS-CoV-2-positive swab (adjusted hazard ratio [aHR] 0.8, 95% CI 0.6-1.0) and seroconversion (adjusted odds ratio [aOR] 0.7, 95% CI ...
PPE monitoring.

What was the big difference?

Are N95s/FFP2s inferior to KF94s?

No, it was supply - and other reasons.
Read 10 tweets
Nov 5, 2025
@tomhanks has just been savaged by people screaming masks don't work.

All hospitals have fiduciary responsibilities to not waste money.

Here is a light sampling of hospitals mandating masks because they work.

Proving that not only do masks work, but mask mandates work.

Thread
Health PEI
Start/End: October 14, 2025 , How many hospitals: 7, employee count: 4,967,

Public hospital,

City: Various (e.g., Charlottetown, Summerside), Province: Prince Edward Island, Country: Canada, full url: princeedwardisland.ca/en/news/health…
Horizon Health Network
Start/End: September 3, 2025 How many hospitals: 12, employee count: 15,000, public or private:

Public hospital.

City: Various (e.g., Saint John, Fredericton),
Province: New Brunswick,
Country: Canada horizonnb.ca/coronavirus-co…
Read 70 tweets

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