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Mice were immunized intra-peritoneally with 108 CFU-equivalent of live RB51, RB51WboAKF, or inoculated with saline. Values are shown as mean ± standard deviation (n = 5). Asterisks indicate statistically significant differences from the corresponding saline group. *, P < 0.05; **, P < 0.01; ***, P < 0.001.
