FIG. 1.

Survival rates of nonimmunized (upper panel) and immunized (lower panel) mice infected i.c. with L. monocytogenes WT, ΔinlAB2, and ΔplcB2. Nonimmunized mice infected i.c. with ΔplcB2 survived significantly longer than mice infected with WT or ΔinlAB2 (P < 0.05). Immunized mice infected i.c. with ΔplcB2 had a significantly increased survival rate compared to that of mice infected with WT or ΔinlAB2 L. monocytogenes (P < 0.05). Data represent survival rates of 10 mice per experimental group. The results of one of two experiments which gave comparable results are shown.