CD8A and infection: At day 7 post‐infection, we found that IVCD45‐CD8+ T cells in pgB/pGP96‐NT co‐immunization group showed up‐regulated IFN‐γ secretion compared to that in pgB‐immunized group (Figure 5D), from 4.08 ± 1.14%, 1.00 × 104 ± 0.44 × 104 to 7.80 ± 1.13%, 4.10 × 104 ± 0.79 × 104 as shown in Figure 5E,F.