Figure 1. Viable counts of Salmonella Typhimurium ST313 and ST19 in cecal contents and spleen following oral infection of the chicken.

Viable counts (CFU/g) of cecal content (A) and spleen (B) at 3 and 7 days post-oral infection of two week old commercial egg laying chicks with 10⁸ CFU ST313 (D23580, Q456) and ST19 (F98, 4/74) S. Typhimurium. Counts are shown as individual birds with the bar representing the median value. Five birds from each group were killed for sampling at each time point (n = 5) in each experiment. Data shown for D23580 and 4/74 (n = 10 per time point) is combined data for two separately repeated experiments. Statistical comparison was made using a Kruskal-Wallis test. *, P<0.05. **, P<0.01. ***, P<0.001.