Introduction to Immunology

Abstract

The immune system is a complex network of components functioning to provide host defense. This network consists of immunologic cells and their products (e.g., interleukins and colony-stimulating factors), organs, tissues, complement, and major histocompatibility complex antigens. These components are organized into specific and nonspecific immune systems, the major functional activities of which include antigen presentation and cell-mediated cytotoxicity.