Exactly! I used to work in a hospital in the U.S. and had to be quite familiar with Standard Precautions. (What kind of protective clothing or disinfecting procedures should I use in this area? Etc.) In a health care setting, there are only two reasons to wear these ridiculous procedure masks that most people are running around in: Don't spit into someone's wound while performing surgery and don't get bodily fluids splashed onto your mouth. Even if there actually was something in the air that you didn't wish to inhale, the size of the holes in the mask don't matter unless you've got an airtight seal between the mask and your face. And good luck standing behind one of those useless Plexiglass shields that everyone is putting up all over the place.