Though another thing to consider is that, at least in my jobs, when the 5 days were exhausted, you just ate annual leave days when you were sick - or you just brought the bug into the office.
I think it's this. We always just powered through it.
About a decade ago I developed a sudden severe illness when I was on contract work with a certain University.
After my 5 days were used up the University simply started docking 20% of my weekly pay for every day I was not able to come in.
(Looking back on it, it was deeply unethical of them because I was not full time staff and they were docking me 20% even for days when I had no mandated hours. I was in no fit state to argue.)
On the days when I actually had work hours, whenever it was even remotely possible I was dragging myself in to work and crawling around trying to do my job, because others depended on me. In that industry it's just what you do if work won't cover you.
I was fainting, collapsing, falling over, crawling on the floor, all sorts of stuff. Or no pay. But that was just our culture back then. Presenteeism.
Any step away from that is a step in the right direction.