What is reiter's syndrome aka reactive arthritis?

Joint, entheses dz: Reactive arthritis (formerly known as reiter's syndrome) is an uncommon (<0.01%) inflammatory arthritic condition preceded by an infection, usually in the gastrointestinal (i.E diarrhea) or genitourinary (i.e. Uti) tracts. Specific bacterial have been linked to this disease. Rheumatologists call this disease a spondylarthropathy, affecting both joints and entheses primarily.