FIG 8.
S. Pullorum is a poor colonizer of the ceca but an effective invader of the liver. The numbers of viable S. Pullorum and S. Enteritidis bacteria in the cecal content and the liver of 2-day-old chickens were determined at various times (days) after oral infection. Each symbol represents data for an individual chicken (3 chickens/group) in one independent experiment. When no viable colonies were found at a 10−1 dilution after selective enrichment, this suggested a viable count of <3 of log CFU/g, and so log CFU/g=3 was used to represent the bacterial loads in negative animals for statistical analysis. + indicates a statistically significant difference from uninfected controls (+, P < 0.05; ++, P < 0.01). * indicates statistical differences between different serovars (*, P < 0.05; **, P < 0.01).