Different T cell subsets developed during H. pylori infection. C57BL/6 mice were challenged with H. pylori strain PMSS1 or with H. pylori SS1. Mice were sacrificed after 4 weeks of infection, MLN were collected, and expression measured of (A) GATA3, Tbet, RORγt, FoxP3 and (B) IL-4, IFN-γ, IL-17A, IL-10 mRNA by RT-PCR. Five mice per group were used in this experiment.