Allergic reaction

An allergic reaction is an exaggerated, immunologically mediated hypersensitivity response triggered by exposure to normally innocuous environmental antigens, such as foods, drugs, insect venom, or aeroallergens Clinical manifestations can affect pediatric and adult populations and range from localized dermatologic and mucosal signs—including pruritus, urticaria, angioedema, rhinitis, and conjunctivitis—to severe, multisystemic, life-threatening anaphylaxis characterized by bronchospasm, upper a...

An allergic reaction is an exaggerated, immunologically mediated hypersensitivity response triggered by exposure to normally innocuous environmental antigens, such as foods, drugs, insect venom, or aeroallergens It primarily involves type I hypersensitivity mechanisms, wherein allergen cross-linking of specific immunoglobulin E bound to high-affinity receptors on mast cells and basophils provokes rapid cellular degranulation and the systemic release of vasoactive mediators like histamine, leukot...

It primarily involves type I hypersensitivity mechanisms, wherein allergen cross-linking of specific immunoglobulin E bound to high-affinity receptors on mast cells and basophils provokes rapid cellular degranulation and the systemic release of vasoactive mediators like histamine, leukotrienes, and prostaglandins

It primarily involves type I hypersensitivity mechanisms, wherein allergen cross-linking of specific immunoglobulin E bound to high-affinity receptors on mast cells and basophils provokes rapid cellular degranulation and the systemic release of vasoactive mediators like histamine, leukotrienes, and prostaglandins

Clinical manifestations can affect pediatric and adult populations and range from localized dermatologic and mucosal signs—including pruritus, urticaria, angioedema, rhinitis, and conjunctivitis—to severe, multisystemic, life-threatening anaphylaxis characterized by bronchospasm, upper airway obstruction, and cardiovascular collapse

Clinical manifestations can affect pediatric and adult populations and range from localized dermatologic and mucosal signs—including pruritus, urticaria, angioedema, rhinitis, and conjunctivitis—to severe, multisystemic, life-threatening anaphylaxis characterized by bronchospasm, upper airway obstruction, and cardiovascular collapse