I believe it was anthrax that needed just a very small number -- i.e. a handful -- of spores to create the momentum for a meaningful infection in an organism. Other pathogens, like flu viruses and coronavirus, need a lot more of whatever the unit is (virion).
It stands to reason that someone like a clinician, who is going to be inches away from an active case, needs a "more perfect" protection than a person who might just pass an infected individual now and then on the street. Avoid closed areas, though.
I have a bunch of N95 masks from a few years ago, but was in Home Depot to pick up another box. The shelves were bare (Seattle area). One store was all out of vinegar, and the other had a few bottles. Both stores were out of hand sanitizer.
HD had a bunch of Clorax wipes still.
Costco had Clorax wipes, bleach, vinegar, rubbing achohol, Elderberry juice, Vitamin D3, hydrogen peroxide and rice and canned foods. A bit fewer after I left. The only thing I was low on at the house was the bleach - not sure how that happened. Unless I have it squirreled away somewhere.
My wife laughs at me, but not too much. She appreciates that I’m just trying to watch out for us and puts up with it! I try not to argue the point. One - she doesn’t need to be more anxious about things, and two - she hopefully will be right!
According to Steven Hatfield, viruses are in competition with each other. Similar to how different bacterial species compete. So the virus needs to overwhelm an infectious area to become the dominate virus. The king virus if you will. With the crown. There can only be one. Typically we hope it’s a benign king.