FIG 8.
Neonates infected with the Y. enterocolitica ΔyopP strain succumb to infection with faster kinetics than adult mice. Neonatal and adult C57BL/6 mice were infected with 2 × 107 CFU wild-type Y. enterocolitica (●) or the Y. enterocolitica ΔyopP mutant (○). (A) Mortality was determined up to 12 days postinfection. (B) The average percent survival from the experiments in panel A was calculated and graphed as the mean ± standard error. (C) Colonizations of the intestines, MLN, and spleen were determined 6 days postinfection. ns, not significant; *, P ≤ 0.05.