Pair-wise brother-sister comparisons for experimentally infected mice for mortality, <i>Salmonella</i> prevalence, <i>Salmonella</i> load and spleen and liver mass.

Differences in mortality and Salmonella prevalence were tested with Fisher's exact tests, Salmonella load (log10 colony forming units / ml) with paired samples t-test, and spleen and liver mass (residuals from a linear regression of organ mass on body mass) with Wilcoxon Signed Ranks test. Sample sizes are given in parenthesis.