[FRIAM] preprint aerosol covid

[thompnickson2 at gmail.com]

Ok, so.  I read the original thing.  It would seem to predict, wouldn't it, that dry climate transmission would be much lower than wet.  Put it round the other way:  these data would be  a plausible explanation for why the disease is less prevalent in dry climates.  But it isn't.  Am I reading it wrong?  

n

Nick Thompson
ThompNickSon2 at gmail.com
https://wordpress.clarku.edu/nthompson/

-----Original Message-----
From: Friam <friam-bounces at redfish.com> On Behalf Of glen
Sent: Wednesday, January 12, 2022 11:00 AM
To: friam at redfish.com
Subject: Re: [FRIAM] preprint aerosol covid

Yeah, I enjoyed the closed rooms at lockheed. But only the 60Hz ones. The 400Hz rooms were horrible. If the results check out, it spells trouble for me, though, hanging out in breweries ... which usually have higher than normal relative humidity. Stupid virus.

On 1/12/22 08:56, Marcus Daniels wrote:
> We have enough air purifiers to filter the air in the house six times an hour.  It reminds me of the days when I had bitcoin miners running.
> The noise is like being in an airplane all the time.   I rather like fan noise though.   I could sleep in a machine room.
> 
> Marcus
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> *From:* Friam <friam-bounces at redfish.com> on behalf of glen 
> <gepropella at gmail.com>
> *Sent:* Wednesday, January 12, 2022 9:25 AM
> *To:* friam at redfish.com <friam at redfish.com>
> *Subject:* [FRIAM] preprint aerosol covid The Dynamics of SARS-CoV-2 
> Infectivity with Changes in Aerosol Microenvironment
> https://www.medrxiv.org/content/10.1101/2022.01.08.22268944v1 
> <https://www.medrxiv.org/content/10.1101/2022.01.08.22268944v1>
>> Understanding the factors that influence the airborne survival of 
>> viruses such as SARS-CoV-2 in aerosols is important for identifying 
>> routes of transmission and the value of various mitigation strategies 
>> for preventing transmission. We present measurements  of the 
>> stability of SARS-CoV-2 in aerosol droplets (∼5-10µm equilibrated 
>> radius) over timescales spanning from 5 seconds to 20 minutes using a 
>> novel instrument to probe survival in a small population of droplets 
>> (typically 5-10) containing ∼1 virus/droplet. Measurements of 
>> airborne infectivity change are coupled with a detailed 
>> physicochemical analysis of the airborne droplets containing the 
>> virus. A decrease in infectivity to ∼10 % of the starting value was 
>> observable for SARS-CoV-2 over 20 minutes, with a large proportion of 
>> the loss occurring within the first 5 minutes after aerosolisation. 
>> The initial rate of infectivity loss was found to correlate with 
>> physical transformation of the equilibrating droplet; salts within 
>> the droplets crystallise at RHs below 50% leading to a near instant 
>> loss of infectivity in 50–60% of the virus. However, at 90% RH the 
>> droplet remains homogenous and aqueous, and the viral stability is 
>> sustained for the first 2 minutes, beyond which it
> decays to only 10% remaining infectious after 10 minutes. The loss of infectivity at high RH is consistent with an elevation in the pH of the droplets, caused by volatilisation of CO2 from bicarbonate buffer within the droplet. Three different variants of SARS-CoV-2 were compared and found to have a similar degree of airborne stability at both high and low RH.

--
glen
Theorem 3. There exists a double master function.

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