Gut & MicrobiomeBlood antibody patterns flag inflammatory bowel disease a decade before diagnosis
Inflammatory bowel disease (IBD), which includes Crohn's disease and ulcerative colitis, may leave detectable traces in the blood up to a decade before diagnosis. Presented at UEG Week 2026, the study analyzed 2,000 serum samples from 500 people: 200 who later developed Crohn's, 200 who developed ulcerative colitis, and 100 healthy controls. Samples were taken at diagnosis and about 2, 4, and 10 years earlier. Researchers tested antibody responses to roughly 357,000 antigens from bacteria, viruses, food, and the body itself. People who later developed IBD had less antibody diversity than healthy participants. Crohn's was linked to higher responses to herpesviruses and bacterial flagellin, especially in complicated disease or ileal involvement, while responses to encapsulated bacteria fell as diagnosis neared. Ulcerative colitis showed rising responses to herpesviruses and autoantigens. These patterns could eventually support earlier detection and risk prediction, though the work is not yet a clinical test.
