how many types of disease are their based of reservation of time
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A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not due to any immediate external injury.[1][2] Diseases are often known to be medical conditions that are associated with specific symptoms and signs.[1] A disease may be caused by external factors such as pathogens or by internal dysfunctions. For example, internal dysfunctions of the immune system can produce a variety of different diseases, including various forms of
- immunodeficiency,
- hypersensitivity,
- allergiesand
- autoimmune disorders.
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There are four main types: infectious disease, deficiency disease, hereditary disease, and physiological disease.
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