To verify the hypothesis that we would similarly observe improved control of FV infection in the absence of T cell produced IL-10, we infected BALB/c mice with an ablation of IL-10 expression in T cells (Tc-IL-10ko) with FV-Katushka-mTagBFP and compared the infection kinetics in these Tc-IL-10ko mice to the kinetics in BALB/c mice. This evidence concerns the gene IL10 and infection.