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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 /.
A parasitic disease, also known as parasitosis, is an infectious disease caused or transmitted by a parasite. Many parasites do not cause diseases. Parasitic diseases can affect practically all living organisms, including plants and mammals. The study of parasitic diseases is called parasitology. Some parasites like Toxoplasma gondii and Plasmodium spp. can cause disease directly, but other organisms can cause disease by the toxins that they produce.