Perhaps you can explain why the contact within three feet must be PROLONGED in order to get Ebola and why the droplet must contain blood as claimed by a Scientist here.
I don’t claim any such thing so I can’t help you out.
Recent MIT study that turns the CDC 3 foot droplet rule on its head.
With all the confusion over the terms ‘airborne’ and ‘aerosal’ and these new findings a new term needs to be applied.
Virally Loaded Snot Spread Transmission or
VL-SST
I suggest everyone read the article, it’s in English, as well as the cited fomite article.
Why?
Because when the VL-SST lands it becomes a fomite and that’s the lurking direct contact with EVD.
(Snip)
...Indeed, the study finds, the smaller droplets that emerge in a cough or sneeze may travel five to 200 times further than they would if those droplets simply moved as groups of unconnected particles — which is what previous estimates had assumed. The tendency of these droplets to stay airborne, resuspended by gas clouds, means that ventilation systems may be more prone to transmitting potentially infectious particles than had been suspected.... (Go to MIT article for details and high speed video of a sneeze )
The researchers used high-speed imaging of coughs and sneezes, as well as laboratory simulations and mathematical modeling, to produce a new analysis of coughs and sneezes from a fluid-mechanics perspective. Their conclusions upend some prior thinking on the subject. For instance: Researchers had previously assumed that larger mucus droplets fly farther than smaller ones, because they have more momentum, classically defined as mass times velocity.
That would be true if the trajectory of each droplet were unconnected to those around it. But close observations show this is not the case; the interactions of the droplets with the gas cloud make all the difference in their trajectories. Indeed, the cough or sneeze resembles, say, a puff emerging from a smokestack.
“If you ignored the presence of the gas cloud, your first guess would be that larger drops go farther than the smaller ones, and travel at most a couple of meters,” Bush says. “But by elucidating the dynamics of the gas cloud, we have shown that there’s a circulation within the cloud — the smaller drops can be swept around and resuspended by the eddies within a cloud, and so settle more slowly. Basically, small drops can be carried a great distance by this gas cloud while the larger drops fall out. So you have a reversal in the dependence of range on size.”
High-speed imaging has helped MIT researchers determine that some droplets from coughs and sneezes may carry much farther than previous studies had estimated.
Video courtesy of the researchers
Specifically, the study finds that droplets 100 micrometers — or millionths of a meter — in diameter travel five times farther than previously estimated, while droplets 10 micrometers in diameter travel 200 times farther. Droplets less than 50 micrometers in size can frequently remain airborne long enough to reach ceiling ventilation units....(Cont linked article)
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Okay, so the turbulet cloud of a sneeze finally settles and lands on some surface and being virally loaded becomes a fomite.
And this is another new research discovery.
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Long form source scientific link:
http://aem.asm.org/content/73/6/1687.long
Short UK Mail link:
Briefly, the major points regarding spread of viruses via fomites are:
The study found between 40 and 60 per cent of office contaminated in two hours
Pushing buttons in lifts and touching phones spread infection quickest
Disinfectant wipes and regularly washing hands is best way to kill germs
Infections can spread from an office door handle to half the workforce in just two hours, new research has found.
Using tracer viruses, a study found as much as 60 per cent of workers in the building carried the bug planted after 120 minutes....
So there it is.