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Jose-Luis Jimenez Profile picture
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5 Apr, 4 tweets, 2 min read
1/ "Safe Spaces": Outstanding video explaining the main mode of transmission of COVID-19 (airborne) and how to protect ourselves.

By @VickiGSP w/ support from @trishgreenhalgh (+ limited input from me)

Posting as 3 tweets (bc of size limit), then link to complete YouTube video
2/ Part 2 of the video:
3/ Part 3 of the video:
4/ And this is the link to the video on YouTube:

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Jose-Luis Jimenez Profile picture
5 Apr
1/ CO2 and COVID transmission

Our paper (former preprint) is now published after peer-review in Environ. Sci. Tech. Letters:

pubs.acs.org/doi/10.1021/ac… Image
2/ Key concept, pioneered by Rudnick & Milton (2003), is that CO2 and airborne pathogens are exhaled at the same time by infectious people

Inhaling shared air with high CO2 increases virus inhaled (if infectious person present) & thus chance of infection

onlinelibrary.wiley.com/doi/abs/10.103…
3/ Two ways to use CO2: RELATIVE to a situation; and ABSOLUTE (between situations)

RELATIVE is easily understood: wherever you are sharing air, the lower CO2, the lower risk of infection

This is key concept why we recommend CO2 meters (section 9 of tinyurl.com/faqs-aerosol)
Read 16 tweets
Jose-Luis Jimenez Profile picture
1 Apr
1/ DONACIÓN DE MEDIDORES DE CO2 A LATINOAMÉRICA

Gracias a todos/as los que han contribuido a la campaña, que junto a los 10 que dono yo, nos da para 5 medidores +, en total 15.

2/ Con estos son 67 los que hemos donado (si no recuerdo mal), y llegamos a muchos países donde no habíamos llegado antes:

Venezuela, Honduras, Panamá, Guatemala, Uruguay, Brasil, El Salvador

Además de nuevos envíos a Ecuador, Chile, Paraguay, Colombia, México.
3/ Si echan de menos a Argentina es porque van muy por delante y están armando centenares de sus propios medidores. Sigan a @jorgeluisaliaga para los detalles.

Y como estos salen de EEUU no se pueden enviar a España tampoco.

A ambos países hemos enviado muchos medidores antes.
Read 9 tweets
Jose-Luis Jimenez Profile picture
31 Mar
Aerosol Scientists Try to Clear the Air About COVID-19 Transmission

"Medical textbooks have descriptions of virus transmission that are not consistent with basic physics"

By @jrdscience in @AGU_Eos (Official pub. of American Geophysical Union @theAGU)

eos.org/articles/aeros…
2/ "@WHO’s definition of respiratory droplets is wrong. Cloud droplets are around 20 micrometers and they don’t fall to the ground, he said. That means that droplets of larger size could be airborne longer than the WHO acknowledges."
3/ “It’s just absurd”. “This still is the official statement of the @WHO, and they have refused to correct it for a year.”

"@kprather88 and others created an open-source document of frequently asked questions (FAQ) about airborne spread."[tinyurl.com/faqs-aerosol]
Read 4 tweets
Jose-Luis Jimenez Profile picture
31 Mar
1/ Seven Hard and Crucial Lessons of Covid-19

An invisible virus exposes critical blind spots in science and society. But will we learn?

Very useful article to reflect on the pandemic's lessons

elemental.medium.com/7-hard-and-cru…

By @RobertRoyBritt
2/ Lesson 1: Virus science just underwent a paradigm shift

"Sanitizing groceries and drowning our homes with bleach was wrongheaded, in hindsight. The main mode of transmission is through the air, by breathing in aerosols that contain the virus”
3/ L1 (cont):

"@WHO & @CDCgov have been slow to acknowledge the outsized role of airborne spread and to translate what leading experts have been saying since last spring into loud and clear advice."

“Millions of people have been infected because we emphasized defending...
Read 6 tweets
Jose-Luis Jimenez Profile picture
30 Mar
1/ Parece que en España damos 1 paso para adelante y 2 para atrás...

Nueva ley ha salido hoy:

- Grave error: no obliga a llevar mascarillas en aire compartido por no convivientes. En todo momento, AUNQUE SE PUEDA GUARDAR DISTANCIA.
lavozdegalicia.es/noticia/socied…
2/ No es tan difícil de entender por qué hay que llevar mascarilla en interiores EN TODO MOMENTO, independientemente de la distancia.

Hay miles de brotes de superpropagación, todos así: interiores, con distancia, sin mascarilla.

3/ O más fácil de forma gráfica:

[puntos rojos representan el virus, y puntos negros el CO2)

De @numeroteca (numeroteca.org/cat/en-el-aire/)
Read 11 tweets
Jose-Luis Jimenez Profile picture
29 Mar
1/ A very good article in @elpaisinenglish about how to avoid becoming infected with COVID-19 by breathing the air exhaled by others:

(By the team that brought you "A room, a bar, and a classroom")

english.elpais.com/usa/2021-03-29…
2/ Humans exhale CO2. Our metabolism "burns" the foot we eat (carbohydrates, fats, proteins) into CO2 and other products (H2O, urea etc.) to extract energy.

Exhaled air has ~4% CO2 (40000 parts-per-million, or ppm). It is quickly diluted as it mixed w/ ambient air.
3/ We get COVID when we inhale virus-containing aerosols exhaled by others.

Mainly in 2 situations: (1) in close proximity because we inhale much more of the exhaled air of the other person then.

Distance reduces infection mainly because we breathe less of that exhaled air.
Read 17 tweets

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