Their adhesion to the intestinal mucosa is considered one of the main reasons for the beneficial health effects of specific lactic acid bacteria (LAB). However, the influence of disease on the mucosal adhesion is largely unknown. Adhesion of selected LAB to resected colonic tissue and mucus was determined in patients with three major intestinal diseases (i.e., diverticulitis, rectal carcinoma, and inflammatory bowel disease) and compared to healthy control tissue. All strains were observed to adhere better to immobilized mucus than to whole intestinal tissue. Two strains (Lactobacillus rhamnosus strain GG and L. reuteri) were found to exhibit diseasespecific adhesion to intestinal tissue. All tested strains, with the exception of L. rhamnosus strain GG, displayed disease-specific adhesion to intestinal mucus. These results suggest that strains with optimal binding characteristics for a particular intestinal disease can be selected. Specific lactic acid bacteria (LAB) and bifidobacteria have been scientifically shown to be useful for balancing the intestinal microflora and for the management of microflora dysfunctions (20). For many of the health effects, adhesion to the intestinal mucosa is considered important, i.e., antagonism against pathogens (3), transient colonization (1, 15), modulation of the immune system (32), and enhanced healing of damaged intestinal mucosa (4). Adhesion to the intestinal mucosa is therefore considered one of the main properties of the beneficial health effects of selected LAB (13). Fecal levels of lactobacilli and bifidobacteria have been shown to be reduced in patients with inflammatory bowel diseases (IBD) such as Crohn’s disease (CD) and ulcerative colitis (UC) (6, 8, 12) as well as in allergy (16), thus suggesting a role for these bacteria in the prevention of these diseases. For a number of gastrointestinal diseases, specific LAB strains have been used successfully. The duration of rotavirus diarrhea has been shown to be reduced by selected lactobacilli (10, 33). Some, but not all, epidemiological studies suggest that the consumption of milk products fermented with LAB may have some protective effect against changes associated with the occurrence of colon cancer (29). Consumption of individual strains of LAB may promote positive changes in humans during CD (17), juvenile chronic arthritis (18), irritable bowel syndrome (22), UC (34), diverticulitis (7), and chronic pouchitis (9). Disturbances in the composition of the intestinal microflora during these diseases can be counteracted with selected LAB (5, 8, 31). As stated above, adhesion to the intestinal mucosa is considered an important component of the beneficial health effects of selected LAB. However, the influence of the disease on the adhesion of LAB is largely unknown. There are a few reports that indicate that the specificities of different LAB may prove to be different in the gut mucosa of patients suffering from different intestinal diseases (1, 19), and these properties can be related to the adhesive capacity of the strains in question. Therefore, we assessed the ability of probiotic and proposed-probiotic LAB to adhere to human intestinal mucosa or intestinal mucus from patients with IBD (CD and UC), diverticulitis, or rectal carcinoma, and we compared these with LAB adhesion to healthy tissue. With this method, disease- and strain-specific differences in the adhesion properties can be identified and will provide new methods for selecting probiotics for specific intestinal dysfunctions.