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Bacterial recovery in faeces (a), small (b) and large (c) intestine. Mice were killed at 48 and 72 h after intragastric inoculation of 605/03 (▾) and 125/99 (▪) bacterial strains and the number of colony-forming units sorbitol MacConkey agar-negative were determined in stools and intestines as described in Materials and methods. Data represent individual mice. *P < 0·05 and **P < 0·001, compared with 605/03 at 48 h.
