I was tested 2 weeks ago for antibodies after receiving the vaccine. My results were "0." And yet I experienced all the typical side effects from the vaccine, indicating that I probably had an immune response to it.
Nobody knows what any particular antibody count means with respect to risk to your health from a future COVID infection. Instead, we need to be looking at the hard statistics about who's getting admitted into hospitals and who's dying.
The data I've seen is not great, in part because reinfection is pretty rare. This study [0] indicating rates of 31.0% and 3.4% respectively is the best I've seen, but I'd hazard a guess that there's some sampling bias - i.e., healthier people are less likely to get symptomatic reinfection and therefore to get tested, so unhealthy people are overrepresented in the data - so those rates are probably overestimates.
Nobody knows what any particular antibody count means with respect to risk to your health from a future COVID infection. Instead, we need to be looking at the hard statistics about who's getting admitted into hospitals and who's dying.