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 viral infectious disease that results_in inflammation located_in brain of horses and humans, has_material_basis_in Western equine encephalomyelitis virus, which is transmitted_by Culex and transmitted_by Aedes species of mosquitoes. The infection has_symptom fever, has_symptom headache, has_symptom nausea, has_symptom vomiting, has_symptom anorexia, has_symptom malaise, has_symptom altered mental status, and has_symptom weakness. (DO)