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Three cases of erythema nodosum associated with Yersinia enterocolitica infection were reported. They were diagnosed as Yersinosis following isolation of Yersinia enterocolitica from the feces and from serological investigation. The diagnosis was supported by the fact that Yersinia enterocolitica could be separated from the feces at an early stage of infection and that the serum agglutination titer for Yersinia enterocolitica increased within a month of infection. Clinically, the erythema nodosum preceded by abdominal pain and/or diarrhea was a complication of Yersinosis.

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