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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 /.
Bacterial diseases include any type of illness or disease caused by bacteria, a type of microbe.Microbes are tiny organisms that cannot be seen without a microscope and include viruses, fungi, and some parasites as well as bacteria.The vast majority of bacteria do not cause disease, and many bacteria are actually helpful and even necessary to good health.acterial diseases include any type of illness or disease caused by bacteria, a type of microbe.