Therefore, we assessed IFN-γ production by ex vivo restimulation with NP366-74 peptide at day 10 and day 100 post-X31 infection in CD30+/+ and CD30−/− mice and found no significant difference in the proportion of IFN-γ producing CD8 T cells at day 10 or 100 (Figure 2B). This evidence concerns the gene CD8A and infection.