Alsalih N and Raheem SS
Background: Hypersensitivity is a state of overreaction to wide range allergens due to many factors including genetic predisposition and environmental and other factors. Hypersensitivity classified into four major types according to their mechanisms and immune mediators. Type I hypersensitivity also known as anaphylactic or immediate type due to the short time required for symptoms to appear, it is mostly IgE involved.
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