Evidence for T Cell Help in the IgG Response against Tandemly Repetitive Trypanosoma cruzi B13 Protein in Chronic Chagas Disease Patients

Figure 3

Direct ELISA for total IgG reactivity to recombinant B13 protein in the solid phase. The HLA+ group (subjects bearing HLA alleles capable of presenting B13 peptides to T cells,HLA-DQ7, DR1, and DR2); and the HLA− group (subjects bearing other HLA alleles). The horizontal bar indicates median absorbance in each group.