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Hypersensitivity refers to an exaggerated or inappropriate immune response to a substance, which can lead to tissue damage and various allergic reactions. It is classified into four types: Type I (immediate, such as Allergies), Type II (cytotoxic, involving antibodies against cell surfaces), Type III (immune complex-mediated), and Type IV (delayed-type, involving T cells). Symptoms can range from mild reactions, like hives, to severe anaphylaxis. Proper diagnosis and management are essential to mitigate the effects of hypersensitivity reactions.

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2mo ago

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