The Dot-Enzyme linked immunosorbent assay (Dot-ELISA) in the diagnosis of Chagas-disease: I. Comparative study of two antigenic preparations of Trypanosoma cruzi Leia mais sobre The Dot-Enzyme linked immunosorbent assay (Dot-ELISA) in the diagnosis of Chagas-disease: I. Comparative study of two antigenic preparations of Trypanosoma cruzi