FIG. 4.

Antigen-specific proliferation of splenocytes from line N and line 6₁ chickens infected with S. enterica serovar Typhimurium 10 days after hatching as measured by incorporation of [³H]thymidine. The error bars indicate standard errors (n = 5). No statistical differences were observed between any groups, as determined by regression analysis. dpi, days postinfection.