Type I hypersensitivity (or immediate hypersensitivity) is an allergic reaction provoked by reexposure to a specific type of antigen referred to as an allergen. Type I is not to be confused with Type II, Type III, or Type IV hypersensitivities.
Exposure may be by ingestion, inhalation, injection, or direct contact.
Read more about Type I Hypersensitivity: Pathophysiology, Treatment and Prognosis, Examples
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