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Anti-LTB plasma IgG antibodies. LTB-specific plasma IgG response in nonimmunized control (A), S. Enteritidis LTB ghost-immunized (B) and S. Enteritidis ghost-immunized (C) groups were determined at each week postimmunization. Antibody levels are expressed as mean ± standard deviation. The asterisks indicate significant differences between the antibody titers of the immunized and nonimmunized groups (P ≤ 0.05).
