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Serum IgG anti-SBR responses in mice immunized with serovar Typhimurium BRD509(pSBR-CTA2/BnirB) or BRD509(pSBRnirB) by the i.n. (A) or i.g. (B) route. The results are presented as the geometric means of the specific IgG responses ×/÷ the SD of five or six mice in one experimental group. Values significantly different from those of unimmunized controls at P < 0.01 (∗) are indicated. The results from week 3 are from pooled samples of six mice per group.
