A number of 50 patients admitted with arthritis and Reiter syndrome were investigated to detect the presence of Yersinia specific antibodies. The specific antibodies were evidenced in 5 patients (10%)--3 with antibodies to Y. enterocolitica and 2 with antibodies to Y. pseudotuberculosis, in titers greater than or equal to 1/160. The patients were followed in dynamics up to 3-4 months. The antibodies to Y. enterocolitica persisted in time longer than those to Y. pseudotuberculosis. For a better knowledge concerning the germs responsible for sero-negative arthritis, serological investigations for Yersinia, in the patients with arthritis, appeared as necessary.
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