Following oral infection of pig with T. gondii oocysts, a significant increase in IFN-γ, IL-15, TNF-α, and inductible-NO gene expressions, in lymph nodes draining sites of infection colonic lymph nodes (CLNs), jejunal Peyer’s patches (PPs) and MLNs, was observed at 7 days post-infection. The gene discussed is IFNG; the disease is infection.