Survival of B. abortus 2308 Δomp10 in the mouse model. Each group of mice was infected intraperitoneally with B. abortus 2308, Δomp10 mutant strains. Mice were infected by intraperitoneal injection with 1×105 Brucella. The values are shown as means ± SEM of samples from 10 mice. Each point represents the mean±standard deviation of three experiments. Statistically significant differences between the bacterial growth of the parent strain and the mutants are indicated by asterisks (***, P<0.001).