Anti-brush border antibodies (ABBA) in sera from patients with ulcerative proctocolitis and in sera with antibodies against Yersinia enterocolitica 0:3

20 serum samples from patients with ulcerative proctocolitis (UC), and 20 serum samples with previously demonstrated IgG antibodies against Yersinia enterocolitica serotype 0:3 were analyzed with respect to the occurrence of anti-brush border antibodies (ABBA). 50% of the UC-sera and 20% of the anti-0:3 sera were ABBA-positive. Occurrence of ABBA did not apparently correlate to disease activity, or disease extension, or medication.