There are multiple definitions:

1. neutralizing antibody(English)

   • critical contributor to protective responses against most viral infections. Also denoted as NAB
   • IFNß-1a, IFNß-1b
   • Virology, Neuropathy, Immunology
   • https://doi.org….ai.2017.01.004
   • https://doi.org…6/jnnp.73.2.148

2. "natural" antibody(English)

   • AMR, HAR, NHP, PERV
   • Transplantation, Immunology
   • https://doi.org…science.abo7935