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Old 05-20-2021, 06:04 PM   #238
gillygirl
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Quote:
Originally Posted by gravy boat View Post
We will see if there a sudden spike nationwide in 2 weeks.
I don't think we will.

COVID, like other viruses, is here for while -- viruses mutate. So the best you can do is get vaccinated and protect yourself however you see fit.

Remember before COVID how so many with compromised immune systems (COPD, lung cancer and other ailments) wore those same white/blue surgical masks in public as they were recommended by docs to prevent being exposed to germs/viruses? So why does wearing those same masks no longer prevent you being exposed to germs/viruses, but will prevent someone wearing a mask from infecting you? Isn't there a barrier inside the mask? If there is a barrier then it logically blocks going BOTH ways.

I've wondered this for a year -- it makes no sense.

GB


I don’t know why you think masks no longer prevent the wearer from being exposed.

Quote from the CDC:

Source Control to Block Exhaled Virus
Multi-layer cloth masks block release of exhaled respiratory particles into the environment,3-6 along with the microorganisms these particles carry.7,8 Cloth masks not only effectively block most large droplets (i.e., 20-30 microns and larger)9 but they can also block the exhalation of fine droplets and particles (also often referred to as aerosols) smaller than 10 microns ;3,5 which increase in number with the volume of speech10-12 and specific types of phonation.13 Multi-layer cloth masks can both block up to 50-70% of these fine droplets and particles3,14 and limit the forward spread of those that are not captured.5,6,15,16 Upwards of 80% blockage has been achieved in human experiments that have measured blocking of all respiratory droplets,4 with cloth masks in some studies performing on par with surgical masks as barriers for source control.3,9,14

Filtration for Wearer Protection
Studies demonstrate that cloth mask materials can also reduce wearers’ exposure to infectious droplets through filtration, including filtration of fine droplets and particles less than 10 microns. The relative filtration effectiveness of various masks has varied widely across studies, in large part due to variation in experimental design and particle sizes analyzed. Multiple layers of cloth with higher thread counts have demonstrated superior performance compared to single layers of cloth with lower thread counts, in some cases filtering nearly 50% of fine particles less than 1 micron .14,17-29 Some materials (e.g., polypropylene) may enhance filtering effectiveness by generating triboelectric charge (a form of static electricity) that enhances capture of charged particles18,30 while others (e.g., silk) may help repel moist droplets31 and reduce fabric wetting and thus maintain breathability and comfort. In addition to the number of layers and choice of materials, other techniques can improve wearer protection by improving fit and thereby filtration capacity. Examples include but are not limited to mask fitters, knotting-and-tucking the ear loops of medical procedures masks, using a cloth mask placed over a medical procedure mask, and nylon hosiery sleeves.


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