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Antagonism and adhesion among isogenic strains of Lactobacillus reuteri in the caecum of gnotobiotic mice.

Interactions between a wild adhesive Lactobacillus reuteri strain isolated from chicken crop and its isogenic plasmid-free derivative were studied. Antagonism between these strains was tested in vitro or associated with gnotobiotic mice. The cured strains repressed the establishment of the wild, plasmid bearing strain in the gastrointestinal tract of gnotobiotic mice. Interactions between isogenic strains were independent of the amount of cells administered to mice. The cured derivative strain maintains its specific ability to adhere to epithelial cells of chicken crop.