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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 /.
Parasitic diseases are illnesses caused by infestation (infection) with parasites such as protozoa (one-celled animals), worms, or insects.These diseases are widespread in Africa, southern Asia, and Central and South America, especially among children.ther parasitic diseases that are estimated to cause a million or more cases of illness are filariasis, amebiasis, Chagas' disease, leishmaniasis, and African sleeping sickness (trypanosomiasis).