Figure 5: Serum cytokine concentration in mice infected with T. cruzi I strains. Groups of nine mice were inoculated with BT Qro (∆) or Ninoa BT (▴). Serum was obtained from ocular plexus each 3rd day and pooled. Cytokines were measured by ELISA and presented as average of two experiments with standard deviation. (a) IL-12 p40, (b) IFNγ, (c) IL-10, and (d) IL-4. Statistical differences between mice infected with either strain are indicated .