CD40LG and infection: Required numbers of avidity tests were significantly low (p < 0.01 and 0.03, respectively) after the cutoff of CMV IgM antibody titer revision (18.1 and 129.6 avidity tests per one congenital infection case including symptomatic infection, respectively, and 63.5 and 1037.0 avidity tests per one symptomatic congenital infection case, respectively).