Corona Virus #6

[IslandTractor]

See the earlier discussion/explanation about filters in general and efficacy of them. HEPA filter are N100 filters. They still only filter particles greater that 0.3 microns in size, they just do it more effectively.

The SARS-CoV-2 virus and the droplets that it is encapsulated in from breathing/speaking/coughing are much smaller than 0.3 microns.

So, you can bet if someone is sick on an airplane, those droplets are floating around free for all to breathe in. HEPA filters won't do much at all to take them out of the air.

HEPA filtration stops all known viruses even those spread by droplet nuclei such as measles and varicella. Coronavirus is spread by droplet (bigger than droplet nuclei) so HEPA filtration will remove coronavirus from airline cabin air.

In an airline cabin there will be droplet spread from your fellow passengers nearby coughing or talking but any air that has been recirculated (from the vents) will be virus free.

I was a hospital epidemiologist at a Harvard teaching hospital for over ten years and this sort of thing was discussed frequently. Coronavirus requires less stringent air control than measles, Tb, or chickenpox.

 

[Steppenwolfe]

At least you didn't "wish" him dead.

:thumbsup:

 

[cqaigy2]

A buddy of mine at work, has a pocket constitution. We use it to quiz each other, on the amendments. It's a wonder i passed that class on Civics in junior hi school, or maybe i was smarter then.

 

[RSR]

The way i understand it, from someone else's post on this, is that you can imagine it as though you were shooting an arrow into the woods. The gap between the trees is larger than the diameter of the arrow, however, it's very unlikely, that you would be able to shoot an arrow through the woods without hitting a tree. And it would take more than one "arrow" to cause you harm.

Kind of. This is a good article that describes how they work:

N95 Respirators and Surgical Masks | | Blogs | CDC

The point is, at smaller sizes, a relatively large percentage of droplets are going to get through. Will it be enough to infect you? Maybe it will only be an arrow in the foot, maybe it will be five in the chest. A virologist could answer that question better than I. Certainly, the more droplets getting through, the higher the risk.

That's why I wouldn't worry about walking through a grocery store as long as I had a 6 foot separation distance (low concentration). It's also why I would not fly at all right now. If someone is infected, there is a possibility of having a much higher concentration.

 

[RSR]

HEPA filtration stops all known viruses even those spread by droplet nuclei such as measles and varicella. Coronavirus is spread by droplet (bigger than droplet nuclei) so HEPA filtration will remove coronavirus from airline cabin air.

In an airline cabin there will be droplet spread from your fellow passengers nearby coughing or talking but any air that has been recirculated (from the vents) will be virus free.

I was a hospital epidemiologist at a Harvard teaching hospital for over ten years and this sort of thing was discussed frequently. Coronavirus requires less stringent air control than measles, Tb, or chickenpox.

I'm sorry, but you are wrong. Recent academic studies have measured the SARS-CoV-2 virus to be 0.06 - 0.17 microns. Encapsulated in saliva, it is still significantly smaller than 0.3 microns, as the saliva will evaporate in dryer air. A HEPA filter will not filter any smaller particles than an N95 mask. It will just filter the larger ones more efficiently.

 

[RSR]

HEPA filtration stops all known viruses even those spread by droplet nuclei such as measles and varicella. Coronavirus is spread by droplet (bigger than droplet nuclei) so HEPA filtration will remove coronavirus from airline cabin air.

In an airline cabin there will be droplet spread from your fellow passengers nearby coughing or talking but any air that has been recirculated (from the vents) will be virus free.

I was a hospital epidemiologist at a Harvard teaching hospital for over ten years and this sort of thing was discussed frequently. Coronavirus requires less stringent air control than measles, Tb, or chickenpox.

Island - after closely reading the article posted by Lou, I'll amend my assertion that you are wrong, and issue an apology. It looks like opposed to N95 masks, the HEPA filters, while not able to remove everything from the air, are "practically" able to filter droplet diameters that are likely to cause an issue.

So, I concur that you are correct (and please consider this a blanket amendment of my earlier statement about airplanes). I'd still think twice about flying due to the risk of someone close by exposing you before the air is filtered, but once filtered, the amount of droplets that are likely to get through appears minimal.

I consider it a good day when I learn something new. Thanks LouNY for posting the link on HEPA filters.

 

[YanmarFever]

New York coronavirus cases surge 38% overnight to 20,875

Cuomo estimates that up to 80% of the states more than 19.4 million residents will get the coronavirus.
Roughly 13% of all cases have been hospitalized, 621 of the patients have ended up in the ICU and 157 people have died, he said.
New York has run 78,289 COVID-19 tests and is testing more than 16,000 people a day now, he said.

New York coronavirus cases surge 38% overnight to 2,875

 

[Diggin It]

OK. You have a point. But don't be p*ssed off when "your" exercising of "your" liberty kills you...

'You're' goes in one of those spots. I'll let you figure out which.

 

[the old grind]

It seems some here are trying to convince us all that nothing is safe, no mask, no protocol, not the word of one with 10 years experience in epidemiology vs a handful of years on a tractor forum. ("Oh, me .. me .. me .." :wave

It also looks like the 'latest chart/graph' again predicts 100% contagion by 2021 following the curve and thus is as good as proven, right?.

Now then, if making this about rights and the government is another way to talk the virus to death before it beats the zombies to us, I'll play along.

btw, I'm not dead yet or infected, you?

 

[3 Horse Ranch]

I can see some here are trying to convince us all that nothing is safe, no mask, no protocol, not the word of one with 10 years experience in epidemiology vs a handful of years on a tractor forum. ("Oh, me .. me .. me" .. waving hand frantically. )

It also looks like the 'latest chart/graph' again predicts 100% contagion by 2021.

I'm not dead yet, you?

Well, if it's going to be 100% by next year, why don't we just go back to things as normal and accept the illness and deaths as inevitable, instead of crippling ourselves and the resources we have to continue after this thing has passed.