Of the 108 sera samples diagnosed serologically for the presence of toxoplasmosis IgG and/or IgM, 6 Mo samples (5.56%) had positive IgG and positive IgM, 12 (11.11%) (3Mo and 9A) had negative IgG and positive IgM, and 18 (16.67%) (6 N and 12A) had positive IgG and negative IgM. This evidence concerns the gene CD40LG and toxoplasmosis.