However, our results showed that the cellular infiltration is elevated in IL-1R1 KO mice during the early stages of viral infection (Figure 2), although the anti-viral CD4+ T cell responses in the CNS of virus-infected IL-1R KO mice are lower without compromising either peripheral CD4+ T cell responses (Figure 5) or CNS CD8+ T cell responses (Figure 6). This evidence concerns the gene CD4 and viral infectious disease.