In an effort to unify the nomenclature of Trypanosoma cruzi, the causative agent of Chagas disease, an updated system was agreed upon at the Second Satellite Meeting.A consensus was reached that T. cruzi strains should be referred to by six discrete typing units (T.cruzi I-VI).The goal of a unified nomenclature is to improve communication within the scientific community involved in T. cruzi research.The justification and implications will be presented in a subsequent detailed report.