FIG. 3.

Protection after reinfection. H. pylori SS1-infected mice were immunized four times weekly with either inactivated H. pylori SS1 [Inact SS1(Le^y)] or inactivated Hel 305 [Inact Hel 305(Le^x)] or were not immunized (Infection). The bars indicate the geometric mean (GM) numbers of bacteria 2 weeks after reinfection, and the number of bacteria in the reinfection control is included for comparison. Two asterisks indicate that the P value was <0.01, and one asterisk indicates that the P value was <0.05.