Korean study
Wearing kn94 masks (equivalent of ffp2 or n95) is protective against infection by COVID-19
Only 1 healthcare worker infected out of over 180 working for a year with COVID+ patients
Study done in 2020 before vaccines were available
“Are you reading this thread because you said you were worried about CO2 in an N95?
Hypercapnia?
Don't worry - be happy. This thread explains why you should not be worried about those things.
If still worried? We'll get to what YOU can do about it.”
“each successive year of me NEVER getting sick makes it incrementally more funny to be told that masks don’t work
(i haven’t gotten sick in five years and counting. not with ANYTHING. imagine never ever being sick — yeah that’s my masked life and it RULES.)”
“How Much Can a Fashion Earloop Mask Protect You? (The Upgrade Edition) (Trifolds Only)
Let’s talk about masks that anyone might want to wear, no matter what they believe in, just because some of them actually look cute.”
Do N95s and KN95s filter viruses?
Yes.
Here's an electron microscope image of salt particles on the fibes of a KN95 by @zhouliang_mask.
The image is of a NIOSH-type salt loading test of the melt blown filter media used in Zimi 9541.
The "big" crystals are about 1.5 microns. The smaller captured particles are as small viruses like Covid.
Covid virions are about .07 microns, are expelled into the air in larger respiratory droplets.
New: Universal masking&testing reduce hospital infections, so does staff masking
Stopping universal masking&testing led to 25% increase in respiratory viral infections Restarting staff masking led to 33% decrease
8 out of 100 (random sample) died
