Reactive arthritis (ReA) is a non-purulent joint inflammation that usually follows bacterial gastrointenstinal or urogenital infections. The classic presentation of ReA is characterized by an asymmetric arthritis usually in the lower limbs associated with urethritis, conjunctivitis and occurrence of other articular or extra-articular manifestations. ReA is classified as a type of seronegative spondyloarthopathy. Approximately 65-85% of patients with ReA are HLA-B27 positive. Regardless of the preceding infection, the clinical picture is similar, but management can differ according to the triggering infection. Treatment of Chlamydia-induced ReA should be started with antibiotics because of several mechanisms by which Chlamydia can cause persistent infection. The disease may have an acute or self-limited course, however some patients develop chronic arthritis.
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