1/ Me envía esto un colega que ha estado de vacaciones en 4 provincias en España:

- Todos los interiores de hostelería abiertos sin ningún tipo de restricción.
- No he visto en 10 días un solo medidor de CO2 en hostelería u otros espacios interiores públicos.
2/ - Poquísimos locales con ventilación cruzada, a pesar de disponer de ventanas practicables.
- En todos los accesos a locales, incluso piscinas, gel hidroalcohólico obligatorio.
3/ Claramente no ha calado que este virus se transmite sobretodo por el aire, al respirar el aire que exhalan otros, sobre todo al hablar, cantar o gritar:

4/ Y tampoco parece que haya llegado el mensaje de que la transmisión por superficies es muy improbable, con 0 casos probados. Si la pandemia se transmitiera así, no seria tan difícil de probar!

nature.com/articles/d4158…
5/ Como ejemplo, las medidas anti-COVID de los paradores nacionales dan ganas de echarse a llorar. Muchas cosas de desinfección de superficies que no sirven para nada, pero ni una palabra de ventilar o medir CO2 o filtrar el aire etc.

parador.es/es/paradores-s…
6/ Con falta generalizada de medidas para la transmisión de verdad (por aire) + el desperdicio en medidas inútiles q generan falsa sensación de seguridad (desinfección de superficies), pues es normal que la variante Delta mas contagiosa este desbocada

nytimes.com/interactive/20… Image

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More from @jljcolorado

16 Jul
1/ Measuring #covidCO2 around the Western US during a long road trip.

Gas station shops ~1200-2000 ppm, even though not too many people. Only see AC, no real ventilation typically.
2/ Stayed at a hotel in Wyoming. Asked for exterior rooms, but none available when arrived after 11 hr drive.

Concerning: 800 ppm in room when we entered. 2500 when we woke up. Had fan on all night, but no real ventilation.
3/ @CDCgov recommends keeping CO2 in shared air under 800 ppm... Clearly it is a big problem in many places, requiring serious work.

Unfortunately it is likely that nothing will be done is most places in the absence of a mandate. Worries me with #deltacovid
Read 4 tweets
28 Jun
1/ DONATION of CO2 METERS to SOUTHEAST ASIA

I am helping @zerocovidthai in this campaign. If you live in SE Asia and are interested in receiving a CO2 meter, please fill this form:

forms.gle/ehW5oGendiR6mA…

With generous donations and discounts from @AranetIoT
2/ In short, CO2 is an indicator of how much exhaled air (and thus potentially virus) is present in indoor air.

Portable CO2 meters allow us to identify poorly ventilated spaces, and improve ventilation (e.g. adjust windows, esp. important if outdoors is hot or cold)
3/ The linked thread has an extensive explanation and links to other documents and scientific papers:

See many examples with the #covidCO2 tag

Read 7 tweets
25 Jun
1/ NEW CAMPAIGN: I'M HELPING @zerocovidthai (with generous support from @AranetloT) to DONATE CO2 METERS to SOUTHEAST ASIA

COVID-19 is mostly transmitted through the air, by breathing in infectious aerosols, in close proximity or in shared room air (thelancet.com/journals/lance…) Image
2/ For that reason, this is an indoor-dominated pandemic. It is much easier to be infected indoors than outdoors (academic.oup.com/jid/article/22…).

The best infection prevention strategy is do everything that you can outdoors
3/ But we have to go indoors at times.

Measuring the virus in the air is difficult, slow, and expensive.

CO2 indoors marks the presence of exhaled air, and serves as a proxy for the virus (cartoon from @numeroteca)

#covidCO2 Image
Read 32 tweets
13 Jun
1/ Hay gente que dice que "si la COVID se transmitiese por el aire, ya nos habríamos contagiado todos."

No es así: ejemplo de tuberculosis pulmonar (TBP) en Estados Unidos:

- Se transmite por el aire (cdc.gov/tb/topic/basic…)
2/ - No hay inmunidad, hay una vacuna (BCG) pero no se usa en EEUU (cdc.gov/tb/topic/basic…).

- La vacuna BCG no protege de TBP ni impide la transmisión (historyofvaccines.org/index.php/cont…
3/ Sin embargo, a pesar de que se transmita por el aire, en EEUU no tenemos una pandemia de TBP comparable on la COVID-19.

- En 1.5 anios llevamos > 33 M de casos de COVID en EEUU (10000 casos por 100000 habitantes nytimes.com/interactive/20…)
Read 10 tweets
13 Jun
La entrevista con @XLSemanal sobre las formas de contagio y el lío con la OMS @WHO se puede leer en:

La clave: "Se habría logrado bajar mucho la tasa de contagio si se hubiera aceptado que el aire era una forma de contagio y la forma de protegerse"

xlsemanal.com/personajes/202…
Un detalle es que la carta de los 239 científicos se publicó en julio 2020, no en abril como dice el artículo. Tal vez se lo dije mal al hablar deprisa.
Tambien la 1a frase del articulo "Es prácticamente imposible que las miles de gotitas que emitimos al hablar infecten a las personas y los objetos que nos rodean." no es algo que diría yo. Porque no es imposible, simplemente es una forma seguramente poco importante de contagio.
Read 4 tweets
25 May
1/ The article "A room, a bar, and a class: how the coronavirus is spread through the air" in @elpaisinenglish has just won the Ortega y Gasset Prize, the most prestigious for the Spanish language press.

The thread below summarizes the article.
2/ The article was written by @javisalas and @Mariano_Zafra.

The same team also wrote this article later on how measuring CO2 is useful to reduce transmission.

3/ The article that won the award was based on our shared-room air transmission estimator. It remains correct, although with the new variants transmission goes up some (the estimator allows taking this into account).

tinyurl.com/covid-estimator
Read 5 tweets

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