[Elimination from the Digestive Tract of a "gnotoxenic" Child of a "Lactobacillus Casei" Strain, Isolated from a Commercial Preparation: Antagonistic Effect of an "Escherichia Coli" Strain of Human Origin, Demonstrated in "gnotoxenic" Mice (author's...]

A strain of Lactobacillus casei from a pharmaceutical preparation became established in the digestive tract of an axenic child. It was eliminated by the first bacteria occurring after inoculation of the child's digestive tract with a human flora, before the child was taken out of the isolator. Using "gnotoxenic" mice, we found that the elimination of L. casei was due to a bactericidal effect of the Escherichia coli of human origin, within the digestive tract.