The first time(of two) I was exposed to covid by my roommate, we didn't have tests(he later had an antibody test that was positive), but I never developed any symptoms. Who knows, but I was protected from acute illness. The second time he brought it home, we had tests, where he tested positive on multiple days, and I never tested positive nor showed symptoms. Both times, I took no precautions since I was initially exposed before I could mask or distance myself. I have pictures of my negative results, but I don't think you'd accept that as evidence. I just bring this up because there's still a lot of people who don't believe these vaccines work at all, and I am anecdata that shows they do work to reduce or prevent disease(and even infection, proved by rapid testing). Those were two cases where someone in the (small) household was sick. I'm sure, as I work in public education, I've been exposed many more times, but I can't say anything about public exposure since I don't have proof of exposure or duration.

Did the CDC or any health organization also make this claim? Genuinely curious