Prof. Jose-Luis Jimenez Profile picture
Jan 24, 2022 6 tweets 3 min read Read on X
1/ @Nature: "COVID-19: endemic doesn’t mean harmless"

"The word ‘endemic’ has become one of the most misused of the pandemic. And many of the errant assumptions made encourage a misplaced complacency."

By @ArisKatzourakis

nature.com/articles/d4158…
2/ "A disease can be endemic and both widespread & deadly. Malaria killed more than 600,000 ppl in 2020. 10M fell ill with tuberculosis that same year & 1.5M died. Endemic certainly does not mean that evolution has somehow tamed a pathogen so that life simply returns to ‘normal’"
3/ "There is a widespread, rosy misconception that viruses evolve to become more benign. This is not the case: there is no predestined evolutionary outcome for virus to become more benign, especially ones, such as SARS-CoV-2, in which most transmission happens bf severe disease"
4/ "The best way to prevent more, more-dangerous or more-transmissible variants from emerging is to stop unconstrained spread, and that requires many integrated public-health interventions, including, crucially, vaccine equity."
5/ "Thinking that endemicity is both mild and inevitable is more than wrong, it is dangerous: it sets humanity up for many more years of disease, including unpredictable waves of outbreaks. [Better] to consider how bad things could get if we keep giving the virus opportunities."
6/ PS: a related, more humorous take;

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More from @jljcolorado

May 19
1/ Las enfermedades pueden propagarse entre viviendas a través de los sistemas de ventilación compartidos EN ESPANA, según un estudio estadounidense

La nvestigacion analizó un brote de COVID-19 ocurrido en un edificio residencial de Santander al empezar la pandemia
2/ El articulo de la vanguardia q lo cuenta:



Investigacion de @ShellyMBoulder @D_Higuera_Ing et allavanguardia.com/magazine/biene…
@ShellyMBoulder @D_Higuera_Ing 3/ @ShellyMBoulder lidero la publicacion de nuestro estudio sobre la superpropagacion de COVID-19 en el coro de EEUU, que demostraba la transmision por el aire

doi.org/10.1111/ina.12…
Read 9 tweets
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
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
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
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
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

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