FIG. 6.

Changes in expression of IFN-γ (A and B) and Il-1β (C and D) mRNA as determined by quantitative RT-PCR in the spleens (A and C) and cecal tonsils (C and D) of chickens infected with S. enterica serovar Typhimurium 10 days after hatching. The data are expressed as fold increases compared to uninfected control chickens. The error bars indicate standard errors (n = 5). An asterisk indicates that there was a significant difference in mRNA expression between infected chickens and uninfected controls (as determined by a t test). dpi, days postinfection.