Which viruses of any consequence have antibodies that fade? Covid of course and I know some might say the Influenza A virus but I believe the antibodies (Flu A) remain but the virus mutates to a point that the antibodies no longer are effective.
I don’t have a list.
But here’s an abstract on the role of memory T cells, which “remember past occurrences” of the bug
But it is true that some antibodies remain in circulation.
T Cell Memory: Understanding COVID-19
As the SARS-CoV-2 pandemic has progressed, increasing attention has focused on establishing natural and vaccine-induced immunity against this coronavirus and the disease, COVID-19, that it causes. In this Primer, we explain the fundamental features of ...
www.ncbi.nlm.nih.gov
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