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Specific serum antibody response to Salmonella serovar Typhimurium following oral infection of chickens, determined by an ELISA with lysate antigen. (A) IgM anti-Salmonella antibody response (serum diluted 1:400). (B) IgG response (serum diluted 1:400). (C) IgA response (serum diluted 1:25). The data are the mean values for five birds per group for each time. The error bars indicate standard errors of the means. OD 405 nm, optical density at 405 nm.
