Understanding Type I Hypersensitivity: Allergic Reactions and Anaphylaxis

A hypersensitivity to an allergen (e.g., bee sting) exemplifies a type I hypersensitivity reaction, also known as immediate hypersensitivity or anaphylactic reaction. It is characterized by rapid release of histamine and other inflammatory mediators from mast cells and basophils upon exposure to a specific allergen.