There is actually no scientific data that shows we should be wearing masks.
MANY studies have been done on the subject, studying Influenza [[which has larger droplet size than Covid), as well as SARS, Swine Flu etc, and they typically show some benefit from the use of new N95 masks,.. but no benefit of cloth masks,.. and little to no benefit to using surgical masks.
So unless you put on a new surgical mask every time,.. and TIGHTLY bend it over your nose etc, and never have it down off your nose,... etc, etc, etc,... it's a waste of time.
To be effective, you want to have a NEW N95 each time you put on a mask.
Here's a study that compiled the results of a lot of studies on the subject.
And an excerpt from the conclusion section. Where they found N95 masks were effective [[to some degree) against SARS, but not H1N1, and none of the cloth masks were recommended without being replaced constantly or properly sterilized. And that re-using cloth masks without sterilization [[like most all of us ARE doing) actually FACILITATED the transmission of pathogens.
https://academic.oup.com/cid/article/65/11/1934/4068747
Overall, N95 respirators "may" convey greater protection, but universal use throughout a work shift is likely to be less acceptable due to greater discomfort. Our analysis confirms the effectiveness of medical masks and respirators against SARS. Disposable, cotton, or paper masks are not recommended.
The confirmed effectiveness of medical masks is crucially important for lower-resource and emergency settings lacking access to N95 respirators. In such cases, single-use medical masks are preferable to cloth masks, for which there is no evidence of protection and which might facilitate transmission of pathogens when used repeatedly without adequate sterilization [8].
We found no clear benefit of either medical masks or N95 respirators against pH1N1.
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