Figure 3: Cardiac tissue histology of mice infected whit T. cruzi strains. Mice infected with parasites were sacrificed at day 21 post infection and heart was recovered. Tissue was fixed in 4% paraformaldehyde and embedded in paraffin. Five m sections were Hemotoxilin-Eosin stained and observed at 20 in optical microscope. (a) Control noninfected mice, (b) Mice infected with Ninoa strain, and (c) Mice infected with Qro strain.