FIG. 2.

Antigen-specific serum IgM (A), IgG (B), and IgA (C) in line N and 6₁ chickens infected with S. enterica serovar Typhimurium 40 days after hatching. The error bars indicate standard errors (n = 5). a and b indicate that there were significant differences between infected and uninfected line N and 6₁ chickens, respectively (as determined by a t test). An asterisk indicates that there was a significant difference between infected line N and line 6₁ chickens (P < 0.05). dpi, days postinfection.