A monocomponent vaccine effective to moderate the clinical consequences of Chages disease, said vaccine comprising, as active ingredient, an immunogenic component comprising a polynucleotide encoding one or more polypeptide(s) which includes a C-terminal region composed of at least two repetitive units of amino acids, wherein each repetitive unit shows the following amino acid sequence:
- AHSTPSTPVDSS
- and wherein a polypeptide with trans-sialidase activity of Trypanosoma cruzi is fused to the C-terminal region, and
- wherein the vaccine further comprises an adjuvant that does not inhibit trans-sialidase enzymatic activity of the immunogen portion, wherein the adjuvant is aluminum oxide.