In a previous study, the six-amino acidpeptide named KDVAKI orP1425 from SmATPDase1 reacted with IgE and IgG1 immunoglobulins ofsera from S. mansoni-infected mice,indicating it as a relevant epitope.35 Theidentification and characterization of antigenic epitopes are importantto understand the immune response against infections and for the developmentof vaccines and immunodiagnostic methods.36 Thus, our aim in this study was to verify other characteristicsof this peptide and explore its potential application as an immunodiagnosticmarker. The gene discussed is IGHE; the disease is infection.