“…The triggers for this condition are urethritis due to Chlamydia trachomatis or bacterial enteritis due to Salmonella, Shigella, Yersinia, or other enteropathogens. It is known that a high percentage of patients with RS present HLA-B27 4) . RS is grouped among other conditions referred to as SpA and represented by ankylosing spondylitis (AS).…”