In this study, we showed that there was a higher IgG2c response to PMSS1 infection in Tac B6 mice vs Jax mice, whereas mRNA levels of gastric Ifn-γ in PMSS1-infected Tac mice were relatively higher with no statistical significance than those in PMSS1-infected Jax mice at 4 months post infection (MPI). The gene discussed is IFNG; the disease is infection.