"How long diseases like measles and the flu linger in the air — after an infected person has left the room"

@datum And if you're interested in having other fluid-resistant options available, it's a feature noted on all the relevant models in the Sourcing section of the Masking Reference Doc here:
https://texanalysis.com

For instance, lots of folks really like the comfort and low breathing resistance of the 3M VFlex 9205 along with the fact that they cost less than a dollar a piece.
The 3M VFlex 1804 version adds fluid-resistance to that list of good qualities.