| Arthus reaction | |
|---|---|
| Specialty | Emergency medicine  |
In immunology, the Arthus reaction (/ˌɑːrˈtjuːs/) is a type of local type III hypersensitivity reaction. Type III hypersensitivity reactions are immune complex-mediated, and involve the deposition of antigen/antibody complexes mainly in the vascular walls, serosa (pleura, pericardium, synovium), and glomeruli. This reaction is usually encountered in experimental settings following the injection of antigens.