CD4 and Salmonella Infections: To assess whether the newly identified peptide epitopes could elicit Salmonella-specific CD4+ T cell responses that contribute to immune control, we vaccinated wild-type mice at day 5 post Salmonella infection with a mixture of the peptides AhpC154–168, EutC243–257 and STM1540262–276 (8 μg (∼5 nmol) or 40 μg (∼25 nmol) of each peptide).