CD40LG and toxoplasmosis: Considering high prevalence of toxoplasmosis, and the importance to characterize the disease in its early stage, the present study was conducted to detect the correlation of IgG, IgM and IgA antibodies with T. gondii in paired samples of serum and colostrum, and to evaluate the ability to diagnose this disease by using colostrum, as an alternative noninvasive way to obtain biological samples.