Short thread: Are face shields better than masks? Are they more effective against Covid-19? Are they easier and more sociable to wear? (Here's how they look in comparison on me.)pic.twitter.com/z8KMKp7T8a
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Question on aerosols (tiny floating droplets) vs. larger "ballistic" droplets and their comparative viral load. (It's said it takes about 1,000 viral particles to cause an infection.) What's the comparative viral load of aerosol vs. ballistic droplets? Re face shields...
Face shields really stop the larger ballistic droplets, in both directions. But some smaller aerosol droplets can float through on the sides and bottom of a face shield. How big a problem is that, in terms of viral load? Is there any research yet on this?
This guy says aerosols may not infect by themselves:https://twitter.com/jdangjackson/status/1271857819508064256?s=20 …
This might also help. https://www.businessinsider.com/why-face-shields-may-be-better-coronavirus-tools-than-masks-2020-5 … stay well.
You can add a HUD to a faceshield :)
Cool! They look much more boss, too!
The study linked in that article notes: “When a smaller cough aerosol was used (VMD = 3.4 μm), the face shield was less effective, blocking only 68% of the cough and 76% of the surface contamination.”
“In the period from 1 to 30 minutes after a cough, during which the aerosol had dispersed throughout the room and larger particles had settled, the face shield reduced aerosol inhalation by only 23%.”
Compared to what for a mask?
An N95 mask blocks 95% and a P100 mask is blocks 99.97% of >300nm particles. Most transmission is going to occur from people breathing and coughing near you while you’re in environments with people for prolonged periods of time. Not from someone coughing on your face.
This was my thought exactly,I wear a p100 mask and have great confidence in it when used properly. With every inhale breath while wearing face shield,all the air just comes from the bottom and sides which obviously can still carry covid19 virus particles unfiltered into airways
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