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Kinetics of the serum IgG (A) and IgA (B) and fecal IgA (C) responses against Campylobacter GE antigen in A. nancymae monkeys inoculated with escalating doses of C. jejuni and then challenged 56 days later with 7 × 1011 CFU of the homologous strain. Peak immune responses were observed on day 14 in the majority of animals. Arrow indicates dates of challenge of the medium- and high-dose groups, as well as of the naïve positive-control group.
