I’ve been in three COVID trace lines a few levels down. All three traced back to friends of my friend’s young adult kids. The closest I came to getting COVID is a friend’s daughter got it. My friend tested negative. Only one of four kids in the COVID trace lines who tested positive actually got sick. Ironically, he works for Abbott Labs. For those who may not know Abbott Labs makes the COVID test.
I’ll bet most people have been in COVID trace lines and were never aware because people were asymptomatic and not tested.