I got COVID maybe a year ago, and I stayed home from work for a week. One of my friends couldn't believe it. He said "wow you're really gonna stay home for an entire week just because you have COVID?"
Uh... yes? Isn't that how we have always done things? If you're sick, you don't go to work because you'll get others sick. I recall being a kid and getting strep and flu many times and yup - the school nurse would send me home.
But something about the political environment around COVID has caused people to refuse to believe things that they know to be true. It's fascinating.