Reiter syndrome is an autoimmune disease that occurs due to a bacterial infection in the patient’s gut, genitals or urinary tract. The disease is also known as reactive arthritis. Reiter syndrome affects the joints, eyes, skin and urethra. The bacterial infection may be triggered by sexually transmitted diseases Chlamydia and Ureaplasma urealyticum. Patients with Salmonella, Yersinia, Shigella, and Campylobacter, all intestinal infections may also contract the disease.