1/ Update to the FAQs on Protecting Yourself from COVID-19 Aerosol Transmission

tinyurl.com/faqs-aerosol

New section on CO2:

9. Monitoring ventilation using CO2 levels
9.1. Can we use the CO2 level in a space to estimate whether ventilation is good or bad?
2/ 9.2. Are there some complexities of the relationship between CO2 and infection risk
9.3. How can we use continuous CO2 measurements to determine the right amount of natural ventilation in an indoor space?
9.4. What type of CO2 analyzers can be trusted?
3/ 9.5. Do you recommend measuring and displaying CO2 in all public places?

As always feedback is appreciated (through this form: docs.google.com/forms/d/e/1FAI…).

We've been slow in updating but hope to give it a push in the coming weeks.

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More from @jljcolorado

8 Nov
Webinar Aerosoles y COVID-19

Organizado por los Colegios de Médicos de España

Miércoles 18 de octubre, 20 h en España

Ver en directo en youtube.com/c/FFOMC_canal

Explicaré por qué pensamos que la transmisión por el aires es dominante, y la transmisión por gotas mucho menos. Image
2/ Encantado de responder preguntas. Un artículo que puede ser un buen aperitivo:

medscape.com/viewarticle/93…
3/ Y controlar la transmisión por aerosoles no tiene que ser tan difícil ni tan caro, una vez que se explica bien y se hacen una serie de cosas: más actividades al exterior, ajustarse bien la mascarilla sin huecos, ventilar, medir CO2 etc. Detalles aquí:

tinyurl.com/preguntas-espa…
Read 4 tweets
4 Nov
1/ Esta persona hablando en TVE comete dos errores importantes en la ciencia de la transmisión por aerosoles. Esos dos errores son los que le llevan a concluir que los aerosoles son menos importantes. Los detallo aquí
2/ Primer error: dice que porque el volumen de los aerosoles es menor, tienen menos virus.

Esto es seguramente erróneo: para todas las enfermedades que se ha medido (TB, gripe, sarampión, VRS), los aerosoles concentran la mayoría de los patógenos. Ver: thelancet.com/journals/lanre…
3/ Segundo error. Dice que como los aerosoles se depositan más profundamente en el sistema respiratorio, tienen menor capacidad de infectar.

Confusión: los aerosoles *pueden* penetrar más (las gotas no pueden), pero *la gran mayoría de los aerosoles se depositan en la nariz* Image
Read 9 tweets
2 Nov
1/ @WHO ADMITS AEROSOL TRANSMISSION IS IMPORTANT (without actually saying it)

This press conference from @mvankerkhove is very useful and maddening at the same time.

She describes measures that ONLY work to control aerosols.
2/ Yet aerosols / airborne ***are not mentioned at all***. It is left mysterious why all those measures work.

Guess what? That is very confusing to people, and then people can't protect themselves well. They don't know how to adapt the recommendations to their situation.
3/ Hear what @c_drosten , Germany's leading virologist and a key advisor to Angela Merkel, had to say about this. Perhaps a reason why Germany is doing better than a lot of other countries?
Read 7 tweets
1 Nov
1/ Distribución de Medidores de CO2

Hace 6 días @Alejandro_Ibago y yo activamos GoFundMe para recaudar dinero y distribuir medidores de CO2, en distintos países, con el objetivo de concienciar de la importancia de una correcta ventilación para frenar la propagación de COVID-19
2/ Hemos recibido 140 respuestas y no ha sido fácil seleccionar a 25 ganadores

La campaña continua, y enviaremos más si hay mas contribuciones

Hemos llegado, de momento, a 25 medidores (9 que yo aporto + 14 gracias al dinero recaudado + 2 donación de @EspanaAranet)
3/ Los ganadores son:

1. Natalia Rubinstein, Buenos Aires, Argentina.
2. Raquel Hernández, Getafe, España.
3. Johann Andres Mendez, Bogotá, Colombia.
4. José Betés, Zaragoza, España.
5. Ana Laura Cavatorta, Rosario, Argentina.
Read 12 tweets
29 Oct
1/ Watch how coronavirus spreads indoors in a room, a bar, and a classroom

A short article in @FastCompany about the @elpaisinenglish aerosol infographics, that explains the caveats well:

fastcompany.com/90569949/watch…
2/ "The numbers in the visualization shouldn’t be taken as certainties. Though the model is based on peer-reviewed science, it’s still unclear exactly how much virus an infected person sheds, and how much ill-fitting cloth masks reduce the risk of catching the disease...
3/ ... The model also assumes that everyone maintains a two-meter distance from each other at all times.
“So we trust the order of magnitude of the results and especially the relative strengths of different actions such as increasing ventilation or wearing masks...
Read 12 tweets
28 Oct
1/ A room, a bar and a class: how the coronavirus is spread through the air

An outstanding visual about how several "layers of protection" can make us much safer indoors

by @mariano_zafra & @javisalas via @elpaisinenglish

english.elpais.com/society/2020-1…
2/ It makes totally clear that a mask is not a magic protection that makes us totally safe indoors. We also need to reduce crowding and duration indoors, need to ventilate (and to filter, if we can't ventilate enough), talk less and less loudly. Posters:
docs.google.com/presentation/d…
3/ Many more details, including answers to almost every question we get asked frequently, in our FAQs:

tinyurl.com/faqs-aerosol

Written by @linseymarr @ShellyMBoulder @kprather88 @ProfCharlesHaas @WBahnfleth @CorsIAQ @H_Herrmann24 @PollittKrystal Julian Tang, and myself
Read 10 tweets

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