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SBA and OPKA antibody responses induced by oral vaccination with live attenuated S. flexneri 2a vaccines. SBA (A and B) and OPKA (C and D) titers in serum samples from adult U.S. volunteers orally immunized with 107 CFU of CVD 1204 (n = 7) or CVD 1208S (n = 23) vaccine strains before and 28 days after vaccination. The numbers in the upper right of each graph are the number of subjects that seroconverted over the total number of subjects, with the percent seroconversion shown in brackets.
