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IgG response to serotype Typhimurium LPS in mice 21 days following inoculation with serovar Typhimurium vaccine strains. Anti-LPS IgG was quantified from serum from peripheral blood by ELISA. The titer for each animal (circle) and the mean titer for each group (horizontal bar) are indicated. The mutation(s) of the serotype Typhimurium strain tested in each group is indicated below the graph. All are aroA. − and + indicate the absence or presence of pTetCnirB.
