Share this page!

Devabhaktuni
Twitter logo
Oct 21 • 6 tweets • 3 min read
Some exciting news. A few weeks ago (October 4) my twins presented their first research poster at the American Association of Aerosol Research (#AAAR2022) annual conference in Raleigh, North Carolina!! (1/5)
It was considered as “independent study” by their school principal so it counts as going to school. (2/5) aaarabstracts.com/2022/view_abst…
Here is the original presentation from earlier this year.

• • •

Missing some Tweet in this thread? You can try to force a refresh
　

Keep Current with Devabhaktuni "Sri" Srikrishna

Devabhaktuni

Stay in touch and get notified when new unrolls are available from this author!

Read all threads

This Thread may be Removed Anytime!

PDF

Twitter may remove this content at anytime! Save it as PDF for later use!

Try unrolling a thread yourself!

how to unroll video
  1. Follow @ThreadReaderApp to mention us!

  2. From a Twitter thread mention us with a keyword "unroll"
@threadreaderapp unroll

Practice here first or read more on our help page!

More from @sri_srikrishna

Devabhaktuni
Oct 2
@WmHaseltine keenly points out a new CDC study (Aug 2022) found isolating in different rooms reduced transmission by over 80% during alpha + delta waves. Seems that is the real headline of the study, this data was buried in table 3 and not even mentioned in the abstract. (1/4)
Other things like using different bathrooms, avoiding close contact, also reduced risk of household transmission. Staying in separate room, avoiding close contact, and using own bathroom may be impractical in many cases e.g. large families living in small apartments. (2/4)
Data on mitigation (odds ratio of transmission)

Stayed in separate room (0.17)

Avoided close contact (0.33)

Used own bathroom (0.35)

Avoided sharing drinks and utensils (0.52)

Wore mask (0.81)

Slept in alone in room (0.82)

See Table 3 (3/4)
academic.oup.com/ofid/article/9…
Read 4 tweets
Devabhaktuni
Oct 1
In flight to #AAAR to present a poster w/ my kids “Making Aerosol Precautions for COVID-19 More Easily Accessible and Affordable to Everyone” tysm @HuffmanLabDU. On flight ✈️ I brought tools (CO2, 0.3 μm OPC) to see what’s up here at 30,000 feet 👣 (1/3) aaarabstracts.com/2022/view_abst…
CO2 🧘‍♀️: compared to hair-raising reports of 2000+ ppm on other flights, CO2 has been relatively tame on jet bridge, while airplane ✈️ was on ground, and once in flight about 1000-1500 ppm. Still high relative to home 🏡 (800-1000 ppm) but not as high as I feared. (2/3)
0.3 μm particles⚡️ : much more interesting. After pilots 👩‍✈️🧑‍✈️ turned off seat belt sign, I ran a particle counter 💻 and it was ~10,000 per liter (typical for outdoor). An hour into flight it was ~300 which usually takes ~10 ACH at home. Inflight HEPA filtration at work! (3/3)
Read 4 tweets
Devabhaktuni
Sep 30
How do we reconcile expert differences about level of airflow needed to stop viruses? Lack of expert consensus responsible for ventilation ‘limbo’ from ASHRAE + CDC on what exactly we need to do for infection control in non-healthcare settings (schools, homes, offices). (1/16)
As early as Aug 2020, @ShellyMBoulder was advising 6-9 ACH, “most experts consider roughly 6 air changes an hour to be good… In a pandemic this should be higher.. an exchange rate of 9 times per hour reduced the spread of SARS, MERS and H1N1…” (2/16)

theconversation.com/amp/how-to-use…
Yet her coauthor from the classic paper on the Skagitt Valley superspreading event, @CathNoakes, just this week said to use volume-independent airflow not ACH (volume dependent). (3/16) onlinelibrary.wiley.com/doi/10.1111/in…
Read 18 tweets
Devabhaktuni
Sep 23
Tracking Covid tests in classrooms in 2 waves (Delta + Omicron), Italy’s ventilation study best confirms aerosols as not just a possible route, but main route. Tech + epi details I learnt talking to Drs. Buonanno/Sabile, not obvious to me in preprint (1/) arxiv.org/abs/2207.02678
They analyzed database of SARS-CoV-2 transmission in ~10,000 classrooms (w/o extra ventilation) and w/ ventilation installed in 300+ classrooms. Database was handed to them directly by govt of Marche who invested in ventilation months before Delta/Omicron (not foreseeable). (2/)
In-classroom infection (“clusters”) was officially tracked as >= 2 infections per classroom *in a 5-day period* during Delta (Sept-Dec, 2021), and >=3 during Omicron (January, 2022). 5-day thresholds to define “clusters” standardized by govt. of Marche, not by researchers. (3/)
Read 7 tweets
Devabhaktuni
Sep 23
Is there actually any evidence that ventilation 🌪 actually reduces Covid infection rates in humans 🦠? (1/9)
Yes some want more evidence from the US 🇺🇸. There are some very small-scale trials of air filtration (US/UK) I am aware of but data from these trials most probably won’t be available until next year. Even then their scale will be merely a few percent of data from Italy.
(2/9)
This week I spoke to 2 researchers on an Italian study of 10,000 schools 🇮🇹. From understanding their methods not apparent to me from reading their preprint, there is unlikely to be anything remotely close on the horizon from anywhere in world 🌎. (3/9) reuters.com/world/europe/i…
Read 11 tweets
Devabhaktuni
Sep 16
Has there ever been a federal program in history where "hundreds of billions of dollars" remain unspent? Tens of billions in Emergency Relief (ESSER) money $$ intended to make schools 🏫🧑‍🎓👩‍🎓safe from COVID-19 🦠 remains unspent. Let's look into why it maybe. (1/12)
@AshishKJha46 noted school districts have “access to billions of dollars” from federal government 🦅 🇺🇸 to improve ventilation & filtration 🍃🪟 but why after 2 years hasn't it turned into 6+ ACH 🌪️in classrooms + eating areas where needed most? (2/12)
First, federal government handed money to states and didn't say how to use it. Data below says districts spent the largest share—about 29%—on academic interventions, not upgrading HVAC, ones who did faced delays due to labor + supply chain issues. (3/12) ncsl.org/research/educa…
Read 12 tweets

Did Thread Reader help you today?

Support us! We are indie developers!

This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member ($3/month or $30/year) and get exclusive features!

Become Premium

Don't want to be a Premium member but still want to support us?

Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal

Or Donate anonymously using crypto!

Ethereum

0xfe58350B80634f60Fa6Dc149a72b4DFbc17D341E copy

Bitcoin

3ATGMxNzCUFzxpMCHL5sWSt4DVtS8UqXpi copy

Thank you for your support!

Follow Us on Twitter!

Send Email!

Email the whole thread instead of just a link!

Separate emails with commas

:(