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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
Apr 23
Climate change is a massive problem.

Geoengineering, even if possible, is not going to be a good solution for a variety of ethical (and technical) reasons.

Some thoughts. 🧵
First off, here's a link to The Guardian article that got me thinking about this:
theguardian.com/environment/20…
Essentially, geoengineering involves injecting large quantities of sulfur dioxide (SO2) into the upper atmosphere where it forms clouds that can then reflect sunlight back into space, andthus cooling the planet. Image
Read 15 tweets
Al Haddrell Profile picture
Mar 22
I received this question over on B-Sky, and thought maybe other might have it as well. I thought the easiest way to answer would be to put together a short thread. Image
When it comes to short distance transmission, the proximity one has to the exhalation plume is important. But what dictates the size of the plume (ie how far does the exhaled aerosol initially travel)? And what factors matter? Image
In the initial inhalation plume, there will be a range of particle sizes. The larger particle’s momentum will carry them beyond the plume where they will eventually drop. How far they travel, and how long it takes for them to reach the floor will depend on the size and humidity Image
Read 16 tweets
Al Haddrell Profile picture
Mar 18
A new study came out showing that smoking cannabis leads to “myocardial infarction and cardiovascular risks”. If you understand what happens when inhale a tremendous amount of particulate matter, these findings are not at all surprising.

Some thoughts.

Exposure to elevated levels of particulate air pollution begins a cascade of biological responses.
First, the site where the aerosol deposits will respond. The degree of the response will depend on the cumulative oxidative potential of the aerosol.

If the oxidative stress is high enough, the cells that are dosed will initiate an inflammatory response. Image
Read 8 tweets
Al Haddrell Profile picture
Mar 6
A study has come out the discusses how “new inactivation data significantly influences infection risk predictions”.

Since that “new inactivation data” was from our team’s research, I have some thoughts. Image
Here’s a link to the study:

link.springer.com/article/10.100…
Context:

Prior to 2022, airborne viral decay was described in terms of half-lives, and on the order of hours. Famously, it was reported that SARS-CoV-2 had a half life of 1.1 hrs and could remain infectious in the air for 16 hrs.
Read 20 tweets
Al Haddrell Profile picture
Mar 1
I was asked this question, and thought since it will take a bit of an explanation, I figured I’d make a thread.
Essentially, the question is about the degree to which exhaled water vapour from evaporating aerosol would affect the humidity in a room.
The subtext, is that people exhale CO2, and we use the CO2 concentration in a room to estimate the amount of exhaled air.

Does something similar with water vapour occur? Image
Read 17 tweets
Al Haddrell Profile picture
Feb 26
A paper was published that presented a new model to predict airborne disease transmission. There were many features included in this model that make it interesting.
I have some thoughts.
First off, here's the paper.

royalsocietypublishing.org/doi/10.1098/rs…
The first author of article was written by @ScientistAndre. If you have any questions about it, I’m sure he would be more than happy to discuss.

Moreover, if I get anything wrong, I hope he jumps in to correct me!
Read 16 tweets

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