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Al Haddrell Profile picture
@ukhadds
Jun 22, 2023 • 3 tweets • 1 min read • Read on X
I’m proud to have our latest research published on how long #SARSCoV2 remains infectious while airborne! We studied the fundamental processes that drive the loss of viral infectivity in the aerosol phase. #COVIDisAirborne

Here’s a thread going over some of the findings. Image
@ParentMishmash Interesting question btw. Actually, all of your questions have been. Thanks!
@J__Doh Here are the specific values. So, about 10 to 20 times faster decay in sunlight (depending on the season). Image

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More from @ukhadds

Al Haddrell Profile picture
Oct 25
Over the past decade, various randomized control trials (RCT) have been published that attempt to measure the effectiveness of physical mitigation strategies of airborne disease transmission.

And for the most part, most of them are terrible.

Let me explain why.

A🧵 Image
Airborne disease transmission is extraordinarily complicated, with many steps involved. Consequently, there are many different solutions that have been proposed to limit transmission. They largely involve the removal of exhaled aerosol from the air prior to inhalation. Image
The most common physical interventions being air filtration, ventilation and masking. Image
Read 40 tweets
Al Haddrell Profile picture
Oct 20
If You Want Clean Indoor Air, Not One Thing Will Work!!

How Sadiq Khan is taking a page out of the Team GB Cycling Team’s playbook to clean up London’s air

A 🧵 Image
People spend the majority of their time indoors. As a result, indoor air quality is incredibly important for public health. So then, how do we improve the quality of indoor air?

Well, there are countless ways. That said, they can be grouped into 3 broad areas. Image
1) Source Control

Air is naturally clean. It is largely human activity that pollutes it. So, by limiting the amount of air pollution produced, we can limit our exposure. This includes both indoor and outdoor sources. Image
Read 34 tweets
Al Haddrell Profile picture
Oct 14
Another article came out that is suggesting that ventilation doesn’t work in classrooms.

Does it actually showthat?

No.

Does it find out anything new?

Also, no.

Straw Man Science? Most definitely.

Let’s get into this 🧵 Image
Here’s a link to the study:

jamanetwork.com/journals/jaman…
Context: Air filtration has been argued as an effective means to limit airborne disease transmission. Like any physical intervention of transmission, the effectiveness will depend on how it is used

In this study, they put air filters in classrooms and measured transmission rates Image
Read 19 tweets
Al Haddrell Profile picture
Sep 28
Violet Affleck made headlines this week with a powerful speech at the UN. In it, she discussed the importance of masking in limiting Covid transmission

Her speech also gave us insights into how the right-wing/Murdoch media engages with science in the age of Covid

Some thoughts Image
Augmented Reality (AR): AR is a technology that takes “components of a digital world blend into a person's perception of the real world”. With AR, a person can make “reality” whatever they want it to be.

The Murdoch media empire behaves in a similar way.

en.wikipedia.org/wiki/Augmented…
Alright, so in Violet’s speech she discussed the importance of masking. Well then, what does the science say?
Read 15 tweets
Al Haddrell Profile picture
Sep 8
Evidently this needs to be said:

Do not spray nitric acid into the air in the hopes of limiting viral transmission.

More pollution is not the solution. At all.
This is in response to a paper that came out recently: nature.com/articles/s4200…
The work done in this study is in bulk, meaning that the measurements were not made in aerosol. There is no doubt that biological molecules will be affected by highly acidic conditions. The question is what that has to do with respiratory aerosol.
Read 9 tweets
Al Haddrell Profile picture
Sep 6
Got this question, and it reminded me of a story I heard back during my PhD days.

The question is essentially, is there a problem with breathing too clean of air?

I did my PhD in Simon Fraser University in Vancouver, Canada. As part of the project, I ended up working in St Paul’s hospital, specifically within the James Hogg iCapture Centre.

They have been rebranded, and remain a world leading research facility.

hli.ubc.ca/who-we-are/
During that time, I had the privilege of attending weekly meetings with James Hogg. He was late into his career, and had worked with groups from around the globe. As a result, he always had stories to share about various studies, some published, others not
cdnmedhall.ca/laureates/jame…
Read 11 tweets

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