To determine the relationship between the CD8dim expansion and anti-viral T cells, two immunodominant H-2b-restricted MHV68 epitopes (p56 and p79) [21], [40] were used to identify viral antigen-specific T cells at approximately 6 weeks post infection by both tetramer staining and peptide-stimulated IFN-γ production. Here, IFNG is linked to infection.