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.
An elephantiasis that is characterized by lymphadema located_in the lower extremities caused by a genetically determined abnormal inflammatory reaction to mineral particles in irritant red clay soils derived from volcanic deposits. (DO)