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Online Discussion: Tracking new emerging diseases and the next pandemic since 2005; Coronavirus COVID-19 Pandemic Discussion Forum.

Long distance aerosol transmission

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Pixie View Drop Down
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    Posted: October 29 2020 at 5:08am

https://www.huffpost.com/entry/safe-host-thanksgiving-dinner-covid-pandemic_l_5f8da10fc5b66ee9a5f2333f


perfect weather for an outdoor gathering ― warm to cool air temperatures, low wind speed and weak turbulence ― can actually allow the virus to be airborne longer; coronavirus aerosol particles can spread more than one mile in low wind conditions, which means other outdoor Thanksgiving celebrations could make you sick.



Long dry article but worth the read...


https://www.sciencedirect.com/science/article/pii/S0013935120310677


Local atmospheric factors that enhance air-borne dispersion of coronavirus - High-fidelity numerical simulation of COVID19 case study in real-time

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KiranBhaganagarSudheerBhimireddy

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https://doi.org/10.1016/j.envres.2020.110170

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Highlights

A real-time,high-fidelity simulation of blob of virus filled cough-jet released in the atmosphere has been conducted.

Air-borne is a possible pathway for the transmission of COVID19/.

Atmospheric stability regimes determine the transmission or dilution of the virus blob.

Cough plume with virus aerosols can survive for 30 min and spreading through 1–2 km distance in air before diluting.

The wind direction is an important factor that dictates the direction of the transport from the source.

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Hazelpad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hazelpad Quote  Post ReplyReply Direct Link To This Post Posted: October 29 2020 at 8:59am

Pixie Thanks so much for finding this.  Not read whole thing yet but article you posted although frightening, may explain a few things. Got me thinking.

There are clusters of people in neighbourhoods repeatedly saying they have not been out, had no contact with anyone, but still contracted it.   People think was possibly on the mail or  frozen food etc.

This paper may offer an alternative explanation.

It simulates  a virus cloud from an infected person could go into the atmosphere and stay there in a clump. We knew this happened inside but the paper  claims it  could occurs outdoors also.  We naturally assumed it would be dispersed and diluted by wind   They however claim a  viable  clump of virus can be detected 30 mins later and up to a few km away.   The paper also states virus clumps that land on the ground can evaporated back into the atmosphere still viable days later.  

What if we scale this up. In densely populated cities and large towns where you have literally thousands upon thousands of infected people who are constantly generating and spewing out  virus into the local atmosphere  every time they breath or talk  Could that virus be accumulating and increasing in concentration in the air.    A cycle of heavily contaminated  air  circulating around a city  not diluting out as we assumed it would.

Could this accumulation of virus from ground and from infected aerosols from 1000's of people be enough to infect the air around a city, or towns, like a smog  i.e. the virus may literally be hovering at significant levels in what we think is the fresh outdoor air we are breathing as we stand it our city gardens etc.

Now if this was true then this virus would be acting like no other virus. Acting more like a chemical pollutant.

I don't have the answer but it may be possible.  Think fireworks on bonfire night.  If lots of gardens and parks are setting them off the  the next day stinks as you breath in the sulphurs and smoky air in the next day.  Now substitute the fireworks for infected individuals.  Virus can be detected in large towns sewage system.  So where are sewage works,   do these contribute to the atmospheric load also.

Frightening concept, maybe those of us who live near heavily populated areas should wear masks outside even when no one is in close range.  No hard evidence but thanks for the article, definitely worth a second thought.

Hz x

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Post Options Post Options   Thanks (0) Thanks(0)   Quote morpheuskrs Quote  Post ReplyReply Direct Link To This Post Posted: October 29 2020 at 10:35am

Fascinating article. Fascinating potential.

If there is the merest possibility, that aerosol transmission of this magnitude, and over such a long period of time, can be achieved, then we, as a species, are in much more trouble than most seem to think.

If it can travel several kilometres, collect in clumps, be recycled through waste, and as a result of any or all of these, circulate in larger and larger volumes, around cities, towns, and probably the countryside, then at some point, all of every country's populations (8 Billion and counting), will be infected, with one or more of the multitude of varieties of this virus. Sorry for the long sentence.

Maybe this is the first and second waves, of the planet's latest attempt to prune us down to a more manageable number. At the current rate, the planet will not succeed, as the population of the planet has gone up by 140,000,000 since the pandemic began. That said, if this is the beginning of the pruning, the we had better shape up, because there will soon be an almighty acceleration in the serious and more deadly versions of this virus. And it will not just the vulnerable and old who will be taking the brunt.

On that optimistic note.....Take care of yourselves.  

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Post Options Post Options   Thanks (1) Thanks(1)   Quote Pixie Quote  Post ReplyReply Direct Link To This Post Posted: October 29 2020 at 12:45pm

I was thinking about Wuhan today...the Chinese knew it’s airborne danger and sprayed,I don’t recall any other country that took such an aggressive approach.

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china-sending-trucks-spray-bleach-entire-cities-coronavirus-wuhan.jpeg

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hazelpad Quote  Post ReplyReply Direct Link To This Post Posted: October 29 2020 at 2:06pm

Interesting point, however can you imagine doing this on the streets of Europe, UK, USA.  

Hz x

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