=Parent topics

Allergy [r]: Add brief definition or description
Antigen [r]: A molecule that induces an immune response, such as bee pollen or proteins from viruses or bacteria. ^[e]
Infectious disease [r]: In broad terms, diseases caused by living organisms; also a subspecialty of internal medicine concerned with the treatment of such diseases ^[e]
Immunoglobulin [r]: Proteins produced by lymphocytes, which are primarily antibodies to attack material the body considers hostile, although some may act as cytokines, signaling to other cells ^[e]
Ligand [r]: Add brief definition or description

Subtopics

Agglutination [r]: Add brief definition or description
Complement [r]: Please do not use this term in your topic list, because there is no single article for it. Please substitute a more precise term. See Complement (disambiguation) for a list of available, more precise, topics. Please add a new usage if needed.
Leukocyte [r]: Colourless cells of the immune system which defend the body against both infectious disease and foreign materials, and grouped into neutrophils, eosinophils, basophils, lymphocytes, and monocytes. ^[e]
Opsonins [r]: A family of proteins, generated by various immune mechanisms, which "tag" cells as targets for defensive digestion by cells that perform phagocytosis ^[e]
Phagocytosis [r]: That part of immune response in which defensive cells such as neutrophils and macrophages surround and "digest" foreign particles ^[e]
Neutrophil [r]: Leukocytes (white blood cells) whose primary role is in the cell-mediated immune system, where they destroy hostile substance by phagocytosis. They do release interleukin-12. ^[e]
Macrophage [r]: A type of leukocyte (i.e., white blood cells) that is associated with chronic inflammatory response. It digests foreign cells using the mechanism of phagocytosis, and both circulates in the blood, but later attaches to tissue as a part of local immune response. ^[e]