Just to add onto the anecdote pile. I used to work for a Silicon Valley tech company which, due to it's well-known obsession with secrecy, had office buildings with a lot of closed doors you needed to grab and open to get anywhere. Probably 4-6 different doors to handle just to get to my own office (itself with a door that people grab). I've never taken more sick days in my life. I always seemed to have some sort of URT infection or stomach bug, despite trying my best to keep good hygiene.

I am hoping people get serious about staying home if they’re sick. “I’m not contagious.” If you’re not contagious, then how did the whole office get wiped out?

Too bad companies do have policies about this as it implies discouragement of taking sick days. Perhaps the CDC has some guidelines that help such as "stay home if you have had a fever in the last 48hours".