DISEASE
A
disease is a particular abnormal condition, a disorder of a structure or function
that affects part or all of an organism. The study of disease is called
pathology which includes the causal study of etiology. Disease is often
construed as a medical condition associated with specific symptoms and signs.
It may be caused by external factors such as pathogens, or it may be caused by
internal dysfunctions particularly of the immune system such as an
immunodeficiency, or a hypersensitivity including allergies and autoimmunity.
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