Virus lifespan on surfaces and in air explained

JohnD · 26 Mar 2020

half-lives (or half-distances) never reach zero, so are only useful if you know what a "tolerable" value is, and the original load, and the time taken to reach "tolerable."

the source document didn't say, but no doubt a more reputable disease expert would be able to explain.

motorbiking · 26 Mar 2020

@EFLImpudence The volume isn't relevant. The half live is the observed decay to 50% based on a significant sample. Each cell has a different rate of decay and they are all exposed to the same rate chance of decay. The half life allows a statistical viability to be calculated. But its just a model, based on the half life. The longer the half life the more resiliant.

Each cell has the same chance of lasting 1 minute or 1 day no matter how big the sample.

durhamplumber · 26 Mar 2020

ReJect said:
Isolation seems to be the sensible way

No fekin Sht Sherlockkkkkk

securespark · 26 Mar 2020

Our bins were collected today. Someone sent me a message saying they spoke to one of the fellas and he said to take care because they collect up to 2K bins and there could be the virus on their bins.

EddieM · 26 Mar 2020

motorbiking said:
@EFLImpudence The volume isn't relevant. The half live is the observed decay to 50% based on a significant sample. Each cell has a different rate of decay and they are all exposed to the same rate chance of decay. The half life allows a statistical viability to be calculated. But its just a model, based on the half life. The longer the half life the more resiliant.

Each cell has the same chance of lasting 1 minute or 1 day no matter how big the sample.

Viruses don't have cells. Further they cannot reproduce on their own but require a host cell to do their replication for them.

EFLImpudence · 26 Mar 2020

motorbiking said:
The volume isn't relevant.

The volume might not be but the number is.

The half live is the observed decay to 50% based on a significant sample.

Ok. so if you start with twice as many, that will take an extra time period.

Each cell has a different rate of decay and they are all exposed to the same rate chance of decay.

Then half-life is irrelevant.

The half life allows a statistical viability to be calculated. But its just a model, based on the half life.

so, the 72 hours is irrelevant.

The longer the half life the more resiliant.

I don't follow. If people have a life expectancy of 80 years then there is no half-life.
Some will last longer and some - not half - shorter.

Each cell has the same chance of lasting 1 minute or 1 day no matter how big the sample.

Therefore they might all last one day - or three days (72 hours) as is being stated - and then what?

JohnD · 26 Mar 2020

Remember that most of us live in rooms that are ventilated to some extent, and the amount of pollutants, water vapour and pollutants in the air drops naturally over time.

I read the original document several days ago and did not find it helpful.

Read it yourself and see if you can use it to answer the following real-life questions:

- I have a room that one or more other people were in earlier. One or more of them might or might not have been infected with CV. If I go into the room, will I catch it?

- Without saying how big the room is, or how it is ventilated, how long will it be before it is safe?

sodthisforfun · 26 Mar 2020

Makes me wonder why at Sains today everyone stayed 2 meters apart if it can stay in the air for 3hrs. Christ, am depressed now.

EFLImpudence · 26 Mar 2020

If you are asking me then I have no idea - but possibly?

Bosswhite · 26 Mar 2020

JohnD said:
the video is full of interpretation and selective quoting. the man shown is not, so far as I know, a reputable authority.

His name is Doctor John Campbell and his occupation is research

ReJect · 26 Mar 2020

durhamplumber said:
No fekin Sht Sherlockkkkkk

Well my dear Watson, seems to be a lot of clowns who think otherwise and just my thesis.
But feel free to give your opinion on avoidance advice of this virus (for now), old chap!

JohnD · 26 Mar 2020

Bosswhite said:
His name is Doctor John Campbell and his occupation is research

"a retired Nurse Teacher and A and E nurse based in England."

Notch7 · 26 Mar 2020

Bosswhite said:
His name is Doctor John Campbell and his occupation is research

I think It is this John Campbell:

"Dr. John Campbell is a Senior Lecturer in Nursing studies at the University of Cumbria. He has been a clinical nurse and a nurse tutor for over 30 years"

But nevertheless, his videos seem to be about explaining the technical stuff in a simple way, there is no motive for misinformation or being misleading.

JohnD · 26 Mar 2020

JohnD said:
Read it yourself and see if you can use it to answer the following real-life questions....

Any takers?

ReJect · 26 Mar 2020

JohnD said:
"a retired Nurse Teacher and A and E nurse based in England."

Still an authority on medical subjects though.
Could well be smarter than his medical retired job position suggests.
I just liked that he explained the tests in a basic way for viewers.

Virus lifespan on surfaces and in air explained

durhamplumber

EddieM

sodthisforfun

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