The infection-naive group had a mean IgG level of 1.39 (SEM, 0.152) log10(FI), a mean IgA level of 2.15 (SEM, 0.078) log10(FI), and a mean IgM level of 1.64 (SEM, 0.097) log10(FI). The gene discussed is CD40LG; the disease is infection.