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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
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
Al Haddrell Profile picture
Feb 11
AI (eh-eye, not AL) has rapidly become a common tool people use to answer complex science questions.

But is it reliable?

Storytime. 🧵
Recently, I made a two-part series on my YouTube channel where I discussed the effect of humidity on the transmission of Covid-19.

In researching for the video, I wanted to do a literature survey to see what the animal studies on transmission demonstrated. Image
Read 17 tweets
Al Haddrell Profile picture
Feb 2
This study made some waves on social media yesterday. It purports to show that CO2 concentration doesn’t correlate with covid transmission.

Let’s talk about this, I have some thoughts.

sciencedirect.com/science/articl…
Context: Why do people think knowing the CO2 concentration is important when it comes to Covid transmission?

There are 3 unique reasons.
1) Both CO2 and respiratory (virus containing) aerosol are exhaled. They are, to some degree, correlated. Meaning that if the CO2 concentration in a room is high, the amount of exhaled aerosol in the room may also be high.

Read 28 tweets
Al Haddrell Profile picture
Jan 19
You have no idea. Ironically, I found out about this letter when I was on my way to a dinner to celebrate the end of a 5 year covid project I was on. This project resulted in 14 papers in high impact journals where we explored how SARS-CoV-2 is aerosolised through talking/singing
Needless to say, to find out right then that the government had produced this letter was bizarre and upsetting. Like, why are we doing all of this research if they are just going to ignore it?

When I shared the letter with others on the team, it got a little awkward....
I literally posted this right after I left (hence the tone...).
Read 4 tweets

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