The IgM, IgG, and IgA antibody responses of patients with Yersinia enterocolitica O:3 infection were studied by immunoblotting with plasmid encoded released proteins of Y enterocolitica as the antigens. The results indicate that antibodies of all three classes are most consistently directed against the proteins of molecular weights 25,000 and 36,000. Less than two months after the onset of infection 18 of the 19 patients with yersinia triggered reactive arthritis had IgA class antibodies against the released protein of mol. wt 36,000, whereas only eight of the 17 patients with non-arthritic yersiniosis had these antibodies. The same difference between the arthritic and non-arthritic patients was observed also 8-12 months after the onset of infection.
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