If you’ve got something contagious stay home as much as you can. Doesn’t matter what it is. Cold, flu, covid, whatever, stop spreading diseases. There’s nothing noble about “toughing it out” and making other people sick.
That is not a problem for people that can work from home or have plenty of sick leave. People that work paycheck to paycheck can't afford not to work when they come down with something.
A week ago I was in a crowded room with over 1,000 GA government bureaucrats, mostly healthcare.
We did a stupid HR type exercise where we stood uncomfortably close to another person face to face.
Many of us had a high fever for a couple hours that night. Then it passed and we went to work the next day as normal.
An event of natural immunity. You don’t have to do it. But understand what happens when a crowd gives out a minor inconvenience to prevent a major event later.