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 facial nerve, which leads to paralysis of one side of the face, has_material_basis_in Human herpesvirus 3, which reactivates after appearing as chickenpox in childhood. The infection has_symptom vesicular rash of the ear or mouth, has_symptom tinnitus, has_symptom vertigo, has_symptom otalgia, and has_symptom headache. (DO)