All four T cell subsets displayed statistically significant increases in GM-CSF production during infection compared to baseline (week 0, uninfected) (iNKT cells and γδ T cells, P < 0.0001; CD4+ T cells, P  = 0.0006; CD8+ T cells, P  = 0.0001; one-way analysis of variance [ANOVA] with Dunnett’s posttest). This evidence concerns the gene CD4 and infection.