IgG, IgG1, and IgG2 antibody levels in the sera of dogs inoculated with 2,000 trypomastigotes per kg of body weight of the Berenice-78 T. cruzi strain and treated with RAV at 12 mg/kg b.i.d. (q12h) for 90 days or BZ at 7 mg/kg b.i.d. (q12h) for 60 days compared with the levels in the infected and untreated (infected control [IC]) and noninfected control (NIC) groups. T1, 15 days after infection or before treatment; T2, 75 days of infection or 60 days of treatment; T3, 255 (BZ-treated animals) and 285 (RAV-treated animals) days of infection or 180 days posttreatment. IgG cutoff, 0.338; IgG1 cutoff, 0.170; IgG2 cutoff, 0.315.