A hypersensitivity reaction characterized by presence of IgG that reacts with soluble antigen best describes:

Question

Quizplus · Accepted Answer

A type III hypersensitivity reaction is characterized by the presence of IgG antibodies that react with soluble antigens, forming antigen-antibody complexes that deposit in tissues and cause inflammation and tissue damage. Contact dermatitis (B) is a type IV hypersensitivity reaction and does not involve antibody-mediated reactions. Type II hypersensitivity (C) involves IgG or IgM antibodies binding to cell surface or tissue antigens, causing lysis or damage to the target cells. Asthma (D) is a type I hypersensitivity reaction involving IgE antibodies and immediate release of histamine and other mediators from mast cells.

A Hypersensitivity Reaction Characterized by Presence of IgG That Reacts