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GMTof IgG antibodies to S. sonnei LPS among recipients of S sonnei-rEPA conjugate in a unit in which an outbreak of S. sonnei shigellosis occurred 1–17 days after vaccination. Light blue bars stand for vaccinees who developed S. sonnei shigellosis (n = 14); blue bars stand for vaccinees who did not develop S. sonnei shigellosis (n = 109). GMT = Geometric mean titer. Cohen D. et al. Lancet 1997 [49].
