Which variants survive in the wild is natural selection. Too deadly and it kills the host before spreading. The viruses that spread the most are the ones least noticed.
Example: common cold viruses. They're essentially always there and only make you sick when your immune system weakens a bit, and goes away quickly as well.
Speak for yourself, my son has brought home some gnarly stuff over the past few years lol. About 3 years ago I was sick for like a month and felt not great for 2 months haha.
Example: common cold viruses. They're essentially always there and only make you sick when your immune system weakens a bit, and goes away quickly as well.