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Anti-S. typhi Vi IgG serum levels pre- and post-S. typhi Vi vaccination. Anti-S. typhi Vi IgG levels in 23 paired serum samples from normal adults taken pre- and 4–6 weeks post-S. typhi Vi vaccination. Median values pre- and post-vaccination are given and labelled with X. Two of the 23 serum samples had greater than 55 AU/ml anti-S. typhi IgG prior to vaccination.
