Protection efficacies of Salmonella-based LI vaccines against a virulent S. Typhimurium. Mice immunized with either Salmonella-based LI vaccine constructs or PBS were challenged at 6 weeks post-immunization with a virulent Salmonella strain and motility and bacterial recovery from spleen were recorded. A Motility in immunized and PBS control groups. B Percentage (%) in mouse body weight. C Bacterial load in survived mice post-challenge. Each data points represent mean ± standard deviation (sd) of 5 mice/group.