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Devabhaktuni
@sri_srikrishna
Sep 3 • 5 tweets • 3 min read • Read on X
California (@CAPublicHealth) webpages on ventilation for schools vs skilled nursing facilities are night 🌙 and day ☀️

The school webpage obfuscates quantitative target + tech details needed for clean air in classrooms.

@CorsIAQ @kprather88 @RanuDhillon @AbraarKaran

(1/5)
The CDPH webpage for ventilation in schools is a bunch of cartoons and lacks important quantitative details

(2/5)
cdph.ca.gov/Programs/CID/D…


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But the webpage for skilled nursing which is more thorough and specific (see 2/3 rule which is equivalent to CDC standard).

(3/5)
cdph.ca.gov/Programs/CCDPH…

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The webpage for schools has a link on “sized appropriately” which if you click on then says the number in the “fine print.” It’s almost as if they are trying hard to hide it.

Bottom line up front please.

(4/5) Image
Physics in both schools and skilled nursing facilities are exactly the same (both indoor spaces) and both link to CDC Ventilation webpage. On May 12, 2023, CDC made sure to state the key number at top of their webpage: 5 air changes per hour.

(5/5)
cdc.gov/coronavirus/20…
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More from @sri_srikrishna

Devabhaktuni
Jun 29
HAIR-RAISING ⁉️: @SF_DPH is “aware” of H5N1 in SF wastewater but doesn’t know where it is coming from: animals or humans 🤷‍♀️ 🤷‍♂️?

Timely and insightful coverage by @susrust

I’m quoted: This is concerning b/c of urban origin, not many dairy 🐄 or animal 🐓 farms in SF.

(1/8)
Why don’t we know? SF is relying on OLD-SCHOOL 🏫targeted methods, kind of like a "magnifying glass," 🔎 to look for influenza A and H5.

(2/8)
SF has yet not upgraded to more ADVANCED genetic sequencing of the wastewater samples, analogous to a "zoom lens" 📸 on our phones that can check for mutations 🧬 to reveal if this virus has begun transmitting among humans or not.

(3/8)
Read 8 tweets
Devabhaktuni
Jun 11
Ceiling fan🌸OBLITERATED CLOSE-CONTACT 🧑‍🤝‍🧑 RISK:

In eLetter in Science, we suggested CEILING FANS might cut short-range risk (w/ ventilation for long-range).

Singapore lab found just that (2023): mannequin underneath fan 5 ft from cough 🌬️ inhaled ~ 95% FEWER particles.

(1/6)
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METHODS: To track individual particles as they flowed from cough to inhalation they DID EVERYTHING:

(1) LASER photography

(2) AEROSOL measurements in lab

(3) computer SIMULATIONS with computational fluid dynamics (CFD) on using parallel computation with 960 CPU cores

(2/6) Image
SETUP: The experiments tested how liquid aerosols EMITTED from a cough machine are TRANSPORTED to breathing mannequin placed 5 feet away directly underneath the ceiling fan, with the fan OFF versus ON

(3/6) Image
Read 6 tweets
Devabhaktuni
May 19
A 3000x breakthrough in H5N1 wastewater testing from Texas

Thread🧵

(1/25)
COVID-19 in wastewater was presumed to be from humans 👶👧🧒 but with H5N1 it maybe humans or animals (birds 🦆, cows 🐄 , etc.)

(2/25)
This week CDC rolled out a national influenza A wastewater dashboard 📺 similar to COVID-19 (3/25) cdc.gov/flu/avianflu/h…
Read 25 tweets
Devabhaktuni
May 17
Great, timely coverage by @susrust about a BREAKTHROUGH by Texas scientists @MikeTisza et al in wastewater testing for H5N1 where I was quoted,

“The Texas’ team approach exhibited “proof of principle” for employing metagenomic testing protocol for wastewater and air.”.
BACKGROUND: COVID-19 found in wastewater was presumed to be mostly from humans but with H5N1 it maybe humans or animals (birds, cows, etc).
THE PROBLEM: The wastewater testing in California and on the new national CDC dashboard amplify public worry about the fear of H5N1 spreading in humans without telling us whether it is human or animal origin, or if the
virus is starting to transmit efficiently among humans.
Read 5 tweets
Devabhaktuni
May 12
For EFFICIENT SPREAD of H5N1, this 2023 article by @kakape suggests the following list of 4 mutations are necessary (but not necessarily sufficient):

Thread 🧵

science.org/content/articl…
(1) PB2 —> E627K (single amino acids, glutamate to lysine)
(2) hemagglutinin —> Q226L (one nucleotide) + G228S (two nucleotides)
Read 6 tweets
Devabhaktuni
Feb 27
The trusty Temtop PMD 331 is ISO certified but PRICEY ($1399).

Are there cheaper particle counters to test DIY air purifiers that still work well at 0.3 μm or at submicron particle sizes?

Here is what I found.

(1/9)


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The Temtop PMD 331 is ISO-certified.

It enables testing performance of DIY and HEPA air purifiers at 0.3 μm using AMBIENT aerosols.

It was necessary to convince the peer-reviewers in my publication (2022).

(2/9)
sciencedirect.com/science/articl…
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I first found out about the Temtop PMD 331 in 2021 here on Twitter from a physics professor who (unfortunately) deleted his Twitter account.

Temtop PMD 331 is a GREAT PRODUCT and UNIQUE find, useful for many applications.

(3/9)

temtopus.com/products/temto…
Read 9 tweets

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