Is it possible for a person to test positive for Covid-19 and also test positive for the the SARS anti-bodies?
If so, how do we determine which test is correct?
Even though the two viruses are similar they have parts of their biological structure that are distinct (mostly on the spike) for which antibody tests can be designed around. If designed effectively with high specificity, its unlikely that a person would test positive for both. Consider also the limited global prevalence of sars-cov and associated antibodies.