Role of endogenous IL-12 and IFN-gamma on efficacy of benznidazole to treat experimental infection with Trypanosoma cruzi - Ropert, C.; Alves, O. R.; Vieira, L. Q.; Silva, João Santana da; Romanha, Alvaro José; Gazzinelli, R. T. (Meeting of the Brazilian Society of Immunology, 2000)