Chronic Ag stimulation reduced the quantity of day-30 virus-specific CD8+ T cells. OT-I transferred C57BL/6 mice were single or chronic stimulated with WSN-OVA. On day 30, the frequency of virus-specific CD8+ T cells was determined by flow cytometry. A, Representative flow cytometry virus-specific CD8+ T cells (gated on CD8+ T cells). B, Reduction in virus-specific CD8+ T cells was observed in pooled frequency and absolute number (n = 15 mice/group, p < 0.001). C, Kinetic analysis of virus-specific OT-I cells during 30 days of priming (n = 3 mice/group). D, Reduction of chronic CD8+ T cells in lymphoid and nonlymphoid tissues indicates migration is not impaired.