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Blood could spot Crohn's and colitis, 10 years early
The full story behind my Short: antibody patterns in 2,000 US military blood samples, published in Gut on 18 October 2026. Still a research tool — not an available test.
The short version
Researchers screened 2,000 blood samples from 500 US military personnel: 200 who later developed Crohn’s disease, 200 who later developed ulcerative colitis, and 100 who developed neither [1]. Antibody patterns — including, in future Crohn’s patients, antibodies against Epstein-Barr virus (the virus behind glandular fever) — were already different a decade before diagnosis, and the Crohn’s signal was strongest in people who later had severe, complicated disease [1]. Future colitis patients showed a different pattern, including antibodies against one of the body’s own proteins [1]. Honest caveat: this is not yet a test that can tell someone they will become ill. It is a research tool, needs confirming in other groups, and shows a link rather than proving that a virus causes Crohn’s or colitis [1].
2,000blood samples from 500 US personnel [1]
10 yearsantibody signal before diagnosis [1]
EBVEpstein-Barr signal in future Crohn's [1]
Not a testresearch tool only, not in clinics [1]
What happened
For too long, inflammatory bowel disease (IBD) has usually been treated only after symptoms appear and the gut is already damaged [1]. This study screened blood for antibodies against hundreds of thousands of protein fragments from bacteria, viruses, food and the body’s own tissues [1].
The hope is that IBD could one day follow the path of type 1 diabetes, where blood tests can flag an immune attack before symptoms, allowing earlier treatment [1]. That is a hope, not a current service.
Watch the Short
About this page
The Short uses illustrative photos and diagrams from Wikimedia Commons (credited below); they are not photos of the study itself.
Why it matters
- Earlier could mean less damage. Identifying risk before bowel damage begins could allow earlier monitoring or treatment [1].
- Different fingerprints. Crohn’s and colitis showed different antibody patterns years before diagnosis [1].
- Not proof of cause. An antibody link to Epstein-Barr virus does not prove the virus causes Crohn’s [1].
Full narration (transcript)
A blood sample could warn of Crohn's or colitis, ten years early. Two thousand samples, from five hundred US military personnel. Two hundred later got Crohn's. Two hundred got ulcerative colitis. Scientists screened antibodies against hundreds of thousands of fragments. From bacteria, viruses, food, and the body's own tissues. In future Crohn's patients, antibodies against Epstein-Barr virus stood out. Epstein-Barr causes glandular fever, also called mono. That signal appeared a decade before diagnosis. Strongest in people who later had severe, complicated Crohn's. Future colitis patients showed a different antibody pattern. Including antibodies against their own proteins. One day, it could flag risk, like type one diabetes tests. Caveat: no such test is available yet. It shows a link, not proof a virus causes Crohn's. Still, spotting inflammation before damage could change treatment. For the full story, follow the link in the description.
Sources
- [1] Guardian (Hanad Ahmed, 18 Oct 2026). “Warning signs could predict inflammatory bowel disease a decade before diagnosis” — reporting research published in Gut and presented at United European Gastroenterology, Barcelona. theguardian.com
Credits
Photos (illustrative unless stated): Checking Blood Sample (9955279835) (National Eye Institute, CC BY 2.0); U.S. Air Force Staff Sgt. Thomas C. Sullivan Jr., a laboratory technician assigned to the 319th Medical Support Squadron, places a medical sample into a test tube rack at the medical laboratory on Grand Forks 130522-F-JB669-061 (Staff Sgt. Luis Loza Gutierrez, Public domain); Digestive system - Colon (Crohn's disease) -- Smart-Servier (Laboratoires Servier, CC BY-SA 3.0); Red Blood Cell and Antibodies (Natalie Thaya, CC BY-SA 4.0); Electron micrograph showing three Epstein-Barr virus (EBV) particles colorized pink (NIAID, Public domain); Epstein Barr Virus (NIH BioArt 144) (Courtesy of NIAID Ryan Kissinger, Public domain); Epstein-barr virus (ebv) (Unknown photographer, Public domain); Laboratory Test Tubes; from a medical laboratory in Abuja, Nigeria (Frankincense Diala, CC0); Crohn's disease - colon - high mag (Nephron, CC BY-SA 3.0); Blausen 0603 LargeIntestine Anatomy-ar (Original: BruceBlaus. When using this image in external sources it can be cited as: Blausen.com staf, CC BY 3.0); Ve vont your blood 120727-F-YG608-028 (Airman 1st Class Kate Maurer, Public domain); Human Anatomy (NIH BioArt 519 - 657946) (Courtesy of NIAID Ryan Kissinger, Public domain); HIV and Syphilis Diagnostics Laboratory Workstation (Aliva Sahoo, CC BY 4.0); Crohn's Disease (BruceBlaus, CC BY-SA 4.0).