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 pulmonary fibrosis that is characterized by diffuse destruction, scarring, and thickening of the lung parenchyma in a usual interstitial pneumonia pattern, eventually causing architectural distortion and honeycombing, has_symptom progressive shortness of breath, fatigue, and chronic cough, possibly has_material_basis_in exposure to certain chemicals, autoimmune conditions, and radiation. (DO)