Immunology is the study of the immune system and its reaction to pathogens, as well as its malfunctions (autoimmune diseases, allergies, rejection of organ transplants).
... (SD; Defunct) West Germany Bundesamt fur Verfassungsschutz[?] (BfV, Defunct) Bundesnacrichtendienst[?] (BND) East Germany State Security Service[?] (SSD, ...