A 5% aqueous solution of degraded carrageenan derived from the red seaweed Eucheuma spinosum was fed to guinea pigs in their drinking water over a period of 20-45 days. Occult blood in the faeces and multiple ulcers in the caecum, colon and rectum occurred in 100% of animals by the 30th day. The clinical and pathological features bear a close resemblance to human ulcerative colitis.
The method provides a simple experimental model for the study of various aspects of the pathology of ulcerative lesions in the large intestine as well as the effects of therapeutic agents.
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