11.12: Classifying Immunities Last updated Jan 3, 2021 Save as PDF 11.11A: MHC Polymorphism and Antigen Binding 11.12A: Natural Active Immunity Page ID11812 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy11.12A: Natural Active ImmunityNaturally acquired active immunity occurs when a person is exposed to a live pathogen, develops the disease, and then develops immunity.11.12B: Natural Passive ImmunityNaturally acquired passive immunity occurs during pregnancy, when antibodies are passed from the maternal blood into the fetal bloodstream.11.12C: Artificial ImmunityArtificial immunity is a mean by which the body is given immunity to a disease by intentional exposure to small quantities of it.