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How many types does hypersensitivity have?
Hypersensitivity reactions can be divided into four types: type I, type II, type III and type IV, based on the mechanisms involved and time taken for the reaction. [ These are Type I hypersensitivity also known as immediate or anaphylactic hypersensitivity, Type II hypersensitivity also known as cytotoxic hypersensitivity, Type III hypersensitivity also known as immune complex hypersensitivity and Type IV hypersensitivityalso known as cell mediated or delayed type hypersensitivity. ]
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