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Jon Levy

@jonlevyBU

Oct 16

Tweeted out 3 facts yesterday:
1) Ventilation/filtration reduce exposure
2) Masks reduce exposure
3) COVID infection risk is probabilistic function of exposure

Some requests to show data behind these facts. So here we go… 🧵

First, some ground rules. I will try to clearly define what I mean by each of the 3 facts, rely on first principles, and then provide some review articles or key primary literature to support the fact. I will also use too many gifs.

First - ventilation/filtration reduce exposure.

This relies on the fact that SARS-CoV-2 transmission is primarily through aerosols. This is pretty undisputed at this point. This below article gives 10 key pieces of evidence.

ncbi.nlm.nih.gov/pmc/articles/P…

Read 23 tweets

Jon Levy

@jonlevyBU

Oct 12

@CorsIAQ

Back in the saddle - missed the tail end. But a few quick observations from the portion of the transcript I had, followed by some synthesis thoughts...first, @CorsIAQ brought up the Corsi-Rosenthal box, a great example that basic principles can trump fancy bells and whistles.

They provide 7 additional air changes per hour for classrooms at a cost of $4.20 per student per year. Compare that to cost of educating a student of $13k/year. Literally pennies on the dollar.

Kevin Cho then brought up more holistic perspective including carbon reductions and importance of humidity. Heat recovery technologies can get you there.

Read 14 tweets

Jon Levy

@jonlevyBU

Oct 11

@AshishKJha46

Some periodic thoughts on today's White House Summit on Indoor Air Quality...

@AshishKJha46 kicks off by drawing parallel with water. Important that policy solution for water was NOT to put everything on people to boil own water, but to have institutionalized and systemic change

Health care system can buckle under burden of flu+ COVID + other respiratory diseases. We can't solve this through health care capacity. Burden on health needs to come down through improvements in indoor air quality. Healthy buildings = healthy communities.

Dr. Jha mentions call to action for building owners. whitehouse.gov/cleanindoorair launching today as a resource. ARP funding to schools and elsewhere to improve ventilation. Also working on technical capacity for schools to give necessary expertise. New RFI out from EPA on clean air.

Read 45 tweets

Jon Levy

@jonlevyBU

Jul 9

BA.5 is neither the sniffles nor the apocalypse. Doing nothing during this wave is a terrible idea, and so is telling people they are doomed if they leave home. There are sensible exposure and risk reduction measures, especially during the summer with more outdoor activities.

We just took a family vacation. Very important for mental health. We rapid tested before seeing people and masked when sharing air for extended periods. No masks for swimming, mini-golf, boating, hiking, etc. Ate outdoors when with people. Lots of fun, returned home healthy.

BA.5 is very transmissible, and being outdoors isn’t a “get out of COVID free” card. But a little common sense helps. In a large outdoor crowd for a long time? Wear a mask. Walking in the tranquil woods? Don’t.

Read 9 tweets

Jon Levy

@jonlevyBU

Jun 12

1. I’ve been thinking a lot about the rationales given for various recent COVID policy decisions. Too often leaders use vague invocations of “The Tools” or “The Science” to avoid explaining hard decisions, and this ignores the values implicit in those decisions. 🧵

2. First, I *think* we can all agree that there are some good COVID prevention strategies and some bad ones.

Good: Keeping people with COVID from wandering around nursing homes

Bad: Permanent societal lockdown

3. But most policies sit in the middle - measures that reduce transmission or risk to some extent, with an associated tradeoff.

This is no different from most policies in any setting. There aren’t that many free lunches or single measures that will fix everything.

Read 15 tweets

Jon Levy

@jonlevyBU

May 26

Thurston High School.
Columbine High School.
Heritage High School.
Deming Middle School.
Fort Gibson Middle School.
Buell Elementary School.
Lake Worth Middle School.
University of Arkansas.
Junipero Serra High School.
Santana High School.
Bishop Neumann High School.

Pacific Lutheran University.
Granite Hills High School.
Lew Wallace High School.
Martin Luther King, Jr. High School.
Appalachian School of Law.
Washington High School.
Conception Abbey.
Benjamin Tasker Middle School.
University of Arizona.
Lincoln High School.

John McDonogh High School.
Red Lion Area Junior High School.
Case Western Reserve University.
Rocori High School.
Ballou High School.
Randallstown High School.
Bowen High School.
Red Lake Senior High School.
Harlan Community Academy High School.

Read 28 tweets

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