Therefore, along these lines, IgA variability was investigated in sera to determine cellular phenotypes, including FACS analysis (n = 135) of PB B cells to show in acute infection that IgM and IgG were secreted between 10 and 15 days after infection, in these ratios: IgM: 10.5% (range 4.2–54.1), IgG: 27.9% (range 7.4–64.8). This evidence concerns the gene CD40LG and infection.