Reactive arthritis (ReA) is an autoimmune disorder belonging to the group of seronegative spondyloarthropathies and is characterized by the classic triad of arthritis, urethritis and conjunctivitis. The disease is MONDO_0017376 (reactive arthritis). Also known as: Fiessinger Leroy Reiter syndrome, Fiessinger-Leroy disease, Fiessinger-Leroy-Reiter syndrome, Reiter disease, Reiter syndrome, Reiter's disease, Reiter's syndrome, arthritis urethritica.