RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A hypersensitivity reaction type III disease that is characterized by local vasculitis, has_symptom pain, edema, hemorrhage, or necrosis, and has_material_basis_in deposition of antigen-antibody immune complexes in vascular or serosal walls. (DO)