Adult Still's disease caused by Yersinia enterocolitica infection.

Clinical and biologic features of adult Still's disease developed in a patient who had high antibody titers against Yersinia enterocolitica during his illness. Immunocomplexes containing antibodies against Yersinia antigens were isolated at the beginning of the disease. Yersinia was not isolated from blood or stool specimens probably because we observed the patient during the secondary phase of the disease.