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Measurement of anti-Vi IgG in serum samples from vaccinated subjects (ELISA versus bead). Anti-Vi IgG EU/ml was measured in 51 serum samples collected before vaccination with Vi (day 0) or 28 days after vaccination (day 28). Response to vaccination was calculated by subtracting the day 0 anti-Vi IgG EU/ml from the day 28 value (day 28 − day 0).
