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 is a hemorrhagic fever, has_material_basis_in Omsk hemorrhagic fever virus, which is transmitted_by Dermacentor and transmitted_by Ixodes species of ticks. The infection has_symptom fever, has_symptom chills, has_symptom headache, has_symptom pain in lower and upper extremities, has_symptom stiff neck, has_symptom papulovesicular rash on the soft palate, has_symptom cervical lymphadenopathy, has_symptom conjunctival suffusion, has_symptom blood in the urine, and has_symptom blood in the sputum. (DO)