In certain conditions, a low titer may essentially indicate the efficient removal of infectious pathogens by the immune system. In contrast, a high titer may simply be due to the presence of residual antibodies from a previous infection, or unsuccessful attempts to form antigen-antibody complexes.

What do positive titers mean?

Titers are blood tests that check your immune status to vaccinations or diseases you may have received in the past. If you're titers results are positive, it means that you have adequate immunity to a particular infectious disease. Therefore, you do not need to get that particular vaccine.

What is a good titer for Covid antibody?

With Delta, mRNA vaccinated immunity falls to a titer of about 1:250. "We know that [naturally infected] people have been fairly well protected against reinfection ... so that gives you an idea that maybe a titer of 1:100 gives quite good, though not perfect, protection from infection," he said.