C57BL/6 mice that were either mock-infected or infected with PyV, mCMV, and HV68 were sacrificed 40 days post-infection and splenocytes were co-incubated for 5 h with media alone, allogeneic (Balb/c) splenocytes, or viral peptides to assess IFNg production. The gene discussed is IFNG; the disease is infection.