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Colonization of BALB/c mice by TC mutants of Y. enterocolitica T83. Ten mice were infected by gavage with strain ST7, ST5, or ST6 and killed after 2 days. The numbers of bacteria in the ileum (A), cecum (B), and colon (C) were compared with those of Y. enterocolitica T83 using Student's t test (two tailed). The mean values (short horizontal lines) and the detection limit of 25 CFU (horizontal dashed line) are shown. Mice with undetectable levels were assigned a value of 24.
