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Definition: Disorders caused by abnormal or absent immunologic mechanisms, whether humoral, cell-mediated, or both. Synonym(s): Immune Disorders / Immunologic Diseases / Diseases of Immune System / Immune Diseases /.
1 Immunology is the study of the immune system, which includes the innate and adaptive immune system in humans, for example. 2  Medical physics is the study of the applications of physics principles in medicine.  Microbiology is the study of microorganisms, including protozoa, bacteria, fungi, and viruses.