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Serum IgG and IgA titers against the S. sonnei O antigen 2 weeks after the boosting immunization of guinea pigs with WRSS1. The geometric mean titers from experiments 1 and 2 are shown. Background titers were determined from preimmunization bleeds (PB) and were <50 for both IgG and IgA. Standard errors of the mean are shown. Exp, experiment.
