FIG. 1.

Systemic infection is less severe in C57BL/6 mice than in A/J or ICR mice when inoculated i.g. with L. monocytogenes Scott A. The mice were anesthetized with sodium pentobarbital and then inoculated i.g. with 10⁸ CFU of Scott A. Three days later, the mice were euthanized and the numbers of CFU of listeriae present in the spleens (A) and livers (B) were determined as described in Materials and Methods. The data are given as the mean result ± SEM. for 12 mice per group (two separate experiments with six mice per group). For the C57BL/6 mouse results, P is <0.01 when compared to those for the A/J mice and P is <0.05 when compared to those for the ICR mice, as determined by one-way analysis of variance, followed by the Neuman-Keuls comparison test.