According to top medical experts in the country, the best mask to protect against COVID-19 is a KN95 mask...
The KN95s that aren't approved for use in healthcare settings in the US.
Just like those other Made in China cheapies you buy at the grocery store...
How long does a KN95 mask work?
That’s the correct title for the above link...
He also says increased sneezing can be a sign that individuals should change their masks more often.
Don't wait for the vomiting and seizures.