Pgd− and Pgd− Oat− L. monocytogenes strains are defective in vivo but are not rescued in LysM− mice. C57BL/6 or LysM− mice were infected with 1 × 105 bacteria by i.v. injection, and CFU were quantified in the spleen (A) and liver (B) at 48 h postinfection. Spleen and liver are represented by circles and squares, respectively. Filled and open shapes represent C57BL/6 and LysM− mice, respectively. Statistical significance was evaluated using a Mann-Whitney test. Data are representative of more than 3 independent experiments with similar results. *, P < 0.02; ns, not significant.