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Prof. Jose-Luis Jimenez Profile picture
@jljcolorado
Oct 3, 2020 • 4 tweets • 4 min read • Read on X
La covid se transmite a través de aerosoles: ya es el momento de actuar, tenemos suficientes pruebas

Mi tribuna de hace 6 semanas, ahora se puede leer en libre. Es igual de importante que entonces. Gracias a @javisalas

elpais.com/ciencia/2020-0… a través de @el_pais
2/ Para mas detalles prácticos de qué hacer en esta o aquella situación, mirad las respuestas de nuestro grupo de científicos, incluyendo @linseymarr @kprather88 @ShellyMBoulder @WBahnfleth @CorsIAQ @ProfCharlesHaas, Julian Tang:

tinyurl.com/preguntas-espa…
tinyurl.com/faqs-aerosol
3/ COVID-19 Is Transmitted Through Aerosols. We Have Enough Evidence, Now It Is Time to Act

For those of you that prefer to read in English, my Op-Ed was published by @TIME in the US:

time.com/5883081/covid-…

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More from @jljcolorado

Prof. Jose-Luis Jimenez Profile picture
May 13
1) Something very clear from this Hantavirus outbreak is that @WHO is still quite confused about airborne transmission

Still confuse "close contact" (a setting) with a mechanism of transmission

Do not understand that ease of transmission in close proximity ==> likely airborne
2) Several colleagues have published this note in @bmj_latest summarizing this problem with @WHO:

bmj.com/content/393/bm…
@bmj_latest @WHO 3) I spent a couple of years of my life trying to make progress on this issue. This is how me and many colleagues felt during the pandemic.

Frustrating that @WHO is still very confused

Read 5 tweets
Prof. Jose-Luis Jimenez Profile picture
May 8
(1) Veo el lio que se ha montado con el hantavirus en el crucero y queria decir algunas cosas. La mas importante:

**Esto NO va a ser una pandemia**

Estoy de acuerdo con @mvankerkhove e incluso con Fernando Simon. Y nadie me puede acusar de estar siempre de acuerdo con ellos
(2) ¿Por que no vamos a tener una pandemia de hantavirus?

Porque es un virus q se conoce. La variante de los andes se puede transmitir de persona a persona. Casi seguro q se transmite por el aire, por aerosoles.

Pero con dificultad. NO es un virus muy contagioso.
(3) El hantavirus es menos contagioso que la tuberculosis pulmonar, que la causa una bacteria por transmision por el aire exclusivamente. Y que anda suelta por ahi, pero no causa una pandemia rapida como el SARS-CoV-2.
Read 19 tweets
Prof. Jose-Luis Jimenez Profile picture
May 26, 2024
1/ Survey of CO2 indoors during trip

CO2 (above ~400 ppm outdoors) indicates the amount of exhaled air (& virus) trapped in a space

Also per recent scientific results by @ukhadds, CO2 helps SARS-CoV stay infectious in air much longer

@united flight boarding, pretty terrible! Image
2/ This is the trip so far:

-Low outdoors
-Pretty high ~2000 in @RideRTD bus to airport
- ok ~800 at @DENAirport, except restroom ~1500. Not sure why restrooms at this airport are so often poorly ventilated
- Then boarding on @united, ventilation OFF, so huge increase till ON Image
3/ For details of the recent results on how and why CO2 makes SARS-CoV-2 stay infectious much longer in the air, see this recent thread by @ukhadds

Read 9 tweets
Prof. Jose-Luis Jimenez Profile picture
May 8, 2024
1/ "After four years of fighting about it, @WHO has finally proclaimed that viruses, including the SARS-CoV-2 virus that causes COVID, can be spread through the air"



By @maggiemfoxscientificamerican.com/article/a-figh…
2/ "It took four years to get here because some leaders in public health, medicine and science clung too tightly to precision and semantics"

"One particular moment of shame came on March 28, 2020, when WHO tweeted: “FACT: #COVID19 is NOT airborne.”

3/ "Words matter. When people heard that COVID might spread on surfaces, they wasted time wiping down groceries. People who misunderstood airborne spread needlessly wore masks on outdoor walks and veered off sidewalks to avoid their neighbors."
Read 7 tweets
Prof. Jose-Luis Jimenez Profile picture
Apr 18, 2024
1/ @WHO has published a report on updated terminology for disease transmission

I've seen some debate about it. My take:

- Terminology itself is ok. Big progress
- But no recommendations of how to protect!

Report:

Press release: who.int/publications/m…
who.int/news/item/18-0…
2/ The report was likely the result of intense pressure on @WHO during the pandemic:

- They denied that #COVIDIsAirborne on March 2020
- They finally accepted it 2 years later

nature.com/articles/d4158…
@WHO 3/ To their credit, @WHO did invite some of their critics to be part of the committee.

What was the terminology before. In medical circles:

- droplet transmission: if it happened in close proximity, or if particles were > 5 microns

- airborne transmission: if it happened far
Read 34 tweets
Prof. Jose-Luis Jimenez Profile picture
Mar 28, 2024
1/ New paper in @ScienceMagazine: "Mandating Indoor Air Quality for Public Buildings"

Explaining current status of indoor air quality standards (in short: bad or non-existent), the huge health benefits that would arise from them & proposing a path forward
science.org/doi/10.1126/sc…
Image
2/ "People living in urban & industrialized societies, which are expanding globally, spend more than 90% of time indoors, breathing indoor air (IA)."

"Most countries do NOT have legislated indoor air quality (IAQ) performance standards for public spaces"

science.org/doi/10.1126/sc…
3/ "Few building codes address operation, maintenance, and retrofitting, and most do NOT focus on airborne disease transmission."

"We propose that Indoor Air Quality (IAQ) standards be mandatory for public spaces"

science.org/doi/10.1126/sc…
Read 14 tweets

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