An Arthus reaction is
A) a local reaction at the site of injection with edema and hemorrhage
B) a systemic reaction in which immune complexes increase activating complement
C) a deposition of antibody and interleukin on the membrane of epithelial tissues
D) a local reaction in a large mass of cells which leads to granuloma formation

Question

Quizplus · Accepted Answer

An Arthus reaction is a type III hypersensitivity reaction that occurs when there is an excessive immune response to repeated injections of an antigen, resulting in localized tissue damage and inflammation at the site of injection. This type of reaction is characterized by edema, hemorrhage, and necrosis. It is not a systemic reaction involving immune complex activation or deposition of antibody and interleukin on epithelial tissues. It also does not lead to granuloma formation.

An Arthus Reaction Is