Reactive arthritis and erythema nodosum after gastrointestinal infections caused by Yersinia enterocolitica and Yersinia pseudotuberculossis

After gastrointestinal infection with Y. enterocolitica and Y. pseudotuberculosis, some patients may experience reactive arthritis and erythema nodosum. In the etiopathogenesis of these autoimmune complications, in addition to infectious agents, genetic factors, gender and age of the patients also play a role. In the study of the etiology of reactive arthritis and erythema nodosum after gastrointestinal infection, it is useful to investigate in the serum of patients specific antibodies for selected intestinal pathogens, including Yersinia antigens.