When the investigation was extended to the immune cells isolated from the lungs, it appeared that six days after infection, the N-specific CD8+ T-cell immune response in vaccinated/infected mice was lower compared to that detected in the control’s infected mice, as measured in terms of the intracellular accumulation of IFN-γ, IL-2, and TNF-α (Figure 3). The gene discussed is CD8A; the disease is infection.