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Antibody responses to bundlin in volunteers challenged with wild-type EPEC strain E2348/69. The geometric mean prechallenge (Pre) and day 27 postchallenge titers of veteran volunteers (open columns) or naïve volunteers (filled columns) against α1 and β6 bundlin proteins are shown. The error bars indicate the standard errors of the geometric means. Asterisks indicate significant differences (P < 0.05) between pairs of data.
