Introduction. The nature of immunity ; Humoral immunity ; Cell-mediated immunity -- Immunoassays. The interaction of antibodies and antigens ; Antibody-antigen assays ; Assays of cell-mediated immunity -- The immune system. The tissues and cells of the immune system -- Immune responsiveness. The response of B lymphocytes to antigen ; The immunoglobulins ; The genetic basis of antibody diversity ; The response of T lymphocytes to antigen ; Cellular interactions in cell-mediated immunity ; The effectors of immunity -- Regulation of immune responses. Homeostatic control of immunity ; Immunological tolerance -- Immunity and disease. Immunity and infectious disease ; Immunopathology ; Transplantation immunity ; Tumor immunology