FIGURE 1.
Fold increases in serum vibriocidal antibodies (log10 transformed) in children compared with those seen in older patients in the subset with infection with V. cholerae O1. (Bars) represent the mean (and 95% CI of the mean) increase in vibriocidal responses >16-fold in children and older patients measured as a ratio between convalescence at day 7 (black bars) or day 21 (shaded bars), compared with titers at the acute stage on day 2. *P = 0.01 and 0.0004 for the magnitude of differences between children and older patients at days 7 and 21, respectively.