CD40LG and infection: Whereas the acute subgroup presented a homogenous serological pattern characterised by positive IgM along with low IgG avidity in 91% (ELFA and FC) and late convalescent infection rendered an opposite profile comprising of negative IgM together with high IgG avidity in 97%, a transitional profile with 49% low avidity was observed for early convalescent T. gondii infection.