FIG. 1.

Infection of pregnant mice with L. innocua. Pregnant BALB/c mice were injected i.v. with 5 × 10⁷ bacteria by day 14 of gestation. Animals were monitored by quantifying bacterial growth at intervals. (A) Bacterial growth in spleen and blood of pregnant mice. The results shown are means ± standard errors from groups of five mice (each experiment was repeated twice) and are expressed as the log₁₀ bacteria (CFU) per organ or log₁₀ bacteria per ml of blood. (B) The kinetics of bacterial growth are represented in the left panels by dot plots corresponding to individual bacterial counts for each placenta (top panel) and each fetus (lower panel) for the indicated times. In the right panels, means ± standard errors for each time are given.