Abstract
Hypersensitivity reactions are a set of reactions in which the immune system performs a protective function while also producing an inflammatory consequence. In most cases, both autoimmunity and sensitivities have been responsible for hypersensitivity reactions. In autoimmune contagion, the immune system reacts directly to tissues inside the body, while in sensitivities, the immune system reacts to parts of the environment that are shared. In general, allergic reactions have been put into four groups (Type I, Type II, Type III, and Type IV). This study focuses on hypersensitivity-related illnesses and the role of the immune system in these conditions.
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