Immunology is a branch of biology[1] that covers the study of immune systems in all organisms.Immunology charts, measures, and contextualizes the physiological functioning of the immune system in states of both health and diseases; malfunctions of the immune system in immunological disorders (such as autoimmune diseaseshypersensitivitiesimmune deficiency, and transplant rejection); and the physical, chemical, and physiological characteristics of the components of the immune system in vitroin situ, and in vivo. Immunology has applications in numerous disciplines of medicine, particularly in the fields of organ transplantation, oncology, rheumatology, virology, bacteriology, parasitology, psychiatry, and dermatology

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