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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. Photo by: Jubal Harshaw. 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.arasitic Diseases. Photo by: Jubal Harshaw. 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.