CD40LG and toxoplasmosis: The evaluation of T. gondii antibodies (IgG, IgM, IgA) and IgG avidity test results usually allows physicians to assess the immunologic status of a patient and to diagnose seroconversion [17,18,19], but the serological diagnosis of toxoplasmosis is complex and the interpretation of test results may be complicated by the long-term persistence of specific IgM [17].