Pair-wise brother-sister comparisons for experimentally infected mice for mortality, Salmonella prevalence, Salmonella 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.