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(a,b) Levels of anti-S. typhi Vi IgG levels in adult and child sera. (a) Distribution of anti-S. typhi Vi IgG in normal sera from healthy adult donors (n = 104, age range 20–70 years); (b) distribution from 4–5-year-old preschool children (n = 44). Values are shown as S. typhi Vi IgG AU/ml. Different scales are used in (a) and (b) due to significantly lower concentrations of S. typhi Vi IgG in preschool sera.
