[Yersinia enterocolitica and pseudotuberculosis reactive arthritis with antinuclear antibodies. 4 cases].

Antinuclear antibodies (ANA) were demonstrated in four patients (2 male, 2 female) with reactive arthritis (RA) due to Yersinia enterocolitica (YE) and Yersinia pseudotuberculosis (YPT). Changes in ANA titres and serologic tests were not correlated. The two patients are HLA B27 positive. Polysaccharides could be partly responsible for Yersinia antigenicity. The presence of ANA in chronic forms of RA due to Yersinia warrants discussion.