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Memory B cell responses. S. flexneri 2a LPS-specific memory B cell ALS IgG (a) and IgA (b) geometric mean ELISA endpoint titres with 95% confidence intervals at baseline (day 0), day of challenge (day 56) and 28 days post-challenge (day 84), grouped by vaccinated or placebo subjects. * = significant difference as compared to baseline titres within treatment group as determined by repeated measures ANOVA of log-transformed titres with Bonferroni post-hoc test.
