Most common organism associated with reactive ahritis is
Reactive (spondylo)ahritis (ReA) is a 'reaction' to a number of bacterial triggers with clinical features in keeping with all SpA conditions. The known triggers are Chlamydia, Campylobacter, Salmonella, Shigella and Yersinia. Notably, non-SpA-related reactive ahritis can occur following infection with many viruses, Mycoplasma, Borrelia, streptococci and mycobacteria, including M. leprae, which causes leprosy (Hansen's disease); however, the 'reaction' in these instances consists typically of myoahralgias, is not associated with HLA-B27 and is generally not chronic. The ahritis associated with rheumatic fever is also an example of a reactive ahritis that is not associated with HLA-B27.Sexually acquired reactive ahritis (SARA) is predominantly a disease of young men, with a malepreponderance of 15 : 1. This may reflect a difficulty in diagnosing the condition in young women, in whom Chlamydia infection is often asymptomatic and is hard to detect in practical terms. Between 1% and 2% of patients with non-specific urethritis seen at genitourinary medicine clinics have SARA. The syndrome of chlamydial urethritis, conjunctivitis and reactive ahritis was formerly known as Reiter's disease. Ref Davidsons 23e p1031
Staphylococcus
Shigella
Chlamydia
Yersinia
Immune system