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  • Title: Antibodies to Klebsiella pneumoniae in Dutch patients with ankylosing spondylitis and acute anterior uveitis and to Proteus mirabilis in rheumatoid arthritis.
    Author: Blankenberg-Sprenkels SH, Fielder M, Feltkamp TE, Tiwana H, Wilson C, Ebringer A.
    Journal: J Rheumatol; 1998 Apr; 25(4):743-7. PubMed ID: 9558179.
    Abstract:
    OBJECTIVE: To determine whether the association between increased humoral reactivity against Klebsiella and HLA-B27 associated diseases could be confirmed in Dutch patients with ankylosing spondylitis (AS) and acute anterior uveitis (AAU). METHODS: Under coded conditions sera from Dutch patients with AS, AAU, and rheumatoid arthritis (RA) and from HLA-B27 positive and negative healthy controls were studied for IgA anti-Klebsiella (K54) and IgG anti-Proteus antibodies with the indirect immunofluorescence assay on whole bacteria fixed in suspension with paraformaldehyde. Each group consisted of at least 17 sera. RESULTS: IgA anti-Klebsiella antibody titers were elevated in AS and HLA-B27 negative AAU compared to the HLA-B27 positive and negative controls or patients with active RA (p < 0.001). Furthermore, patients with active RA had elevated levels of IgG antibodies against P. mirabilis compared to every other test or control group (p < 0.001). There was no significant difference between the AS and RA patients in terms of serum C-reactive protein levels, although these were significantly elevated in both compared to healthy controls (p < 0.001), suggesting that the antibody elevations were not due to a nonspecific inflammatory effect. The same sera were blindly tested with negative results by 2 other centers. The discrepancies are probably the result of differences in the methods used. CONCLUSION: Our data support the hypothesis that Klebsiella are involved in the pathogenesis of AS and AAU and that the same might be true for Proteus in RA.
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