Recovery of viable E. faecalis and L. lactis K1 from infected murine peritoneal macrophages at 6, 24, 48, and 72 h postinfection. All E. faecalis strains and L. lactis K1 were grown in BHI broth prior to infection. The results represent the mean and standard error of two experiments. In some cases, the standard error is not indicated, because it is too small to be visible on the graph. Symbols: ○, E. faecalis FA2-2(pAM714); ▴, E. faecalis OG1X; □, E. faecalis MGH-2; ⧫, E. faecalis DS16C2; ┐, L. lactis K1.