For many years it has been considered that there are three basic developmental stages of Trypanosoma cruzi: Epimastigote (Epi), Amastigote (Ama) and Trypomastigote (Typo). Epi and Ama are able to divide while Trypo does not divide. Epi are not infective while Ama and Trypo are able to infect host cells. Here we review the available data for the epimastigote form. Taken together the data show that (a) there are intermediate forms between epimastigotes and trypomastigotes in axenic cultures as well as between amastigote and trypomastigote forms within the cells (both in vitro and in vivo), and (c) that the intermediate forms, here designated as "Transitional Epimastigote", most of the time considered as epimastigotes, are able to infect cells. The recognition of the existence of this stage is of practical importance for those work with T. cruzi. Many laboratories working only with T. cruzi in axenic cultures usually consider to work with nonpathogenic cultures. This attitude needs to be changed requiring special care by those working with this protozoan to avoid accidental infections in the laboratory. In view of these observation a new scheme for the life cycle of T. cruzi is proposed.
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